2023/02/05 更新

写真a

ソエジマ コウイチ
副島 浩一
SOEJIMA Kouichi
所属
教育研究院 自然科学系 地球・生物科学系列 教授
理学部 理学科 教授
職名
教授
外部リンク

学位

  • 博士(理学) ( 1993年3月   東京都立大学 )

研究キーワード

  • Electron Capture Process

  • Photo Ionization

  • Circular Dichroism

  • 電子捕獲反応

  • 多価イオン

  • 光電離

  • 円二色性

  • Multiply Charged Ions

  • 極低温表面分子反応

研究分野

  • 自然科学一般 / 半導体、光物性、原子物理

  • 自然科学一般 / 宇宙惑星科学

経歴(researchmap)

  • Associate Professor, Faculty of Science,

    2001年 - 2003年

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  • 新潟大理学部 助教授

    2001年 - 2003年

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経歴

  • 新潟大学   理学部 理学科   教授

    2017年4月 - 現在

  • 新潟大学   地球環境科学   教授

    2015年4月 - 2017年3月

  • 新潟大学   自然科学研究科 環境科学専攻   准教授

    2010年4月 - 2015年3月

  • 新潟大学   自然科学研究科 環境科学専攻   准教授

    2010年4月 - 2015年3月

  • 新潟大学   自然環境科学科   准教授

    2004年4月 - 2015年3月

  • 新潟大学   自然科学研究科   助手

    1996年8月 - 2001年12月

▶ 全件表示

学歴

  • 東京都立大学   Graduate School, Division of Natural Science

    - 1993年

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  • 東京都立大学   理学研究科   物理学

    - 1993年

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    国名: 日本国

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所属学協会

委員歴

  • 日本物理学会   領域1世話人  

    2002年   

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    団体区分:学協会

    日本物理学会

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  • 原子衝突研究協会   企画委員  

    1997年   

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    団体区分:学協会

    原子衝突研究協会

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論文

  • Detection of Neutral Species in the MALDI Plume Using Femtosecond Laser Ionization: Quantitative Analysis of MALDI-MS Signals Based on a Semiequilibrium Proton Transfer Model 査読

    Tatsuro Shirota, Masashi Tsuge, Yasumasa Hikosaka, Kouichi Soejima, Kennosuke Hoshina

    JOURNAL OF PHYSICAL CHEMISTRY A   121 ( 1 )   31 - 39   2017年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER CHEMICAL SOC  

    We investigated neutral species in the matrix-assisted laser desorption and ionization (MALDI) plume using femtosecond laser ionization spectrometry with simultaneous measurement of the standard MALDI spectrum of the identical MALDI event induced by pulsed UV laser irradiation. The ratio of neutral species in the plume [A](p)/[M](p) (A = phenylalanine (Phe) or alanine (Ala), M = 2,5-dihydroxybenzoic acid (DHB)) was confirmed to be the same as that of the sample mixture in the range of [A](0)/[M](0) = 4 x 10(-4)-1, indicating the validity of the widely adopted approximation [A](p)/[M](p) = [A](0)/[M](0) in the reaction quotient of the proton transfer reaction MH+ + A reversible arrow M + AH(+). An effective parameter representing the extent of thermal equilibrium in the thermal proton transfer model is introduced for the first time. Numerical simulation based on this semiequilibrium model successfully reproduced variations of MALDI signal intensities AH(+) and MH+ with two parameters: the fraction of ionized matrix a <= 10(-5) and an effective temperature T = 1200 and 1100 K for Phe/DHB and Ala/DHB systems, respectively. These values show good agreement with those determined previously by different experimental approaches. The extent of thermal equilibrium was determined to be 95% and 98% for Phe/DHB and Ala/DHB systems, respectively, suggesting that the proton transfer reactions almost proceed to their thermal equilibrium.

    DOI: 10.1021/acs.jpca.6b09591

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  • Electron emission relevant to inner-shell photoionization of condensed water studied by multi-electron coincidence spectroscopy 査読

    Y. Hikosaka, R. Mashiko, Y. Konosu, K. Soejima, E. Shigemasa

    JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA   213   17 - 21   2016年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Multi-electron coincidence spectroscopy using a magnetic-bottle electron spectrometer has been applied to the study of the Auger decay following Ols photoionization of condensed H2O molecules. Coincidence Auger spectra are obtained for three different photoelectron energy ranges. In addition, the energy distribution of the slow electrons ejected in the Auger decay of the Ols core hole is deduced from three-fold coincidences. (C) 2016 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.elspec.2016.10.006

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  • Double core hole spectroscopy with synchrotron radiation 査読

    F. Penent, M. Nakano, M. Tashiro, T. P. Grozdanov, M. Zitnik, K. Bucar, S. Carniato, P. Selles, L. Andric, P. Lablanquie, J. Palaudoux, E. Shigemasa, H. Iwayama, Y. Hikosaka, K. Soejima, I. H. Suzuki, N. Berrah, A. H. Wuosmaa, T. Kaneyasu, K. Ito

    JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA   204   303 - 312   2015年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    In the last five years, a strong experimental and theoretical activity has been dedicated to the study of inner-shell double photoionization. Almost simultaneously, between 2009 and 2011, different experiments were performed using two different light sources: well established third generation synchrotron light sources that exist for more than two decades and recently developed x-ray free electron lasers (X-FEL) that provide brightness of about 10 orders of magnitude higher. The high photon flux of X-FEL has made possible the successive absorption of many x-ray photons by inner-shell electrons in femtosecond timescale. The possibility to create multiple inner-shell vacancies with this new X-FEL light source has resuscitated "prophetic" 25 years old calculations by Cederbaum et al. [1,2] concerning double K-shell ionization that could be of great interest when conventional Electron Spectroscopy for Chemical Analysis (ESCA) finds some limitations. As a feedback, this has stimulated new theoretical developments. On the other hand, it was considered practically out of reach to observe such states with conventional third generation synchrotron light sources due to the very weak probability to eject two inner-shell electrons by a single photon when the dominant process, that could mask everything else, is single inner-shell ionization. However, due to the development of very efficient detection techniques, it was also possible to perform spectroscopy of double core-hole states with excellent accuracy using third generation synchrotron sources.
    In this paper we give an outlook on the basis of recently published results, of the complementarity of these light sources for double core-hole spectroscopy. Some new developments and results are also presented with a prospective of what could be done in the future with the technical breakthrough that will be necessary to improve our further understanding of chemical analysis. (C) 2015 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.elspec.2015.06.015

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  • Site-specific formation of metastable OCS2+ studied by Auger-electron-ion coincidence method 査読

    T. Kaneyasu, M. Ito, K. Soejima, Y. Hikosaka, E. Shigemasa

    JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS   48 ( 12 )   2015年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    We have studied the site-specific formation of metastable OCS2+ in the C1s and the O1s Auger decays of OCS molecules by using an Auger-electron-ion coincidence technique. The coincidence measurement reveals the metastable character of the Auger final states with the (3 pi)-2 configuration. The formation of metastable OCS2+ is observed negligibly in the C1s Auger decay and only weakly in the O1s Auger decay, in contrast to the favorable metastable formation previously reported for S2p Auger decay. It is found that the origin of the site-specificity in the formation of metastable OCS2+ arises from the localization effect of the valence orbital involved in the Auger transition. The dissociative dication states related to individual fragmentation pathways are also derived from the coincidence measurement.

    DOI: 10.1088/0953-4075/48/12/125101

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  • 17aAA-7 オージェ電子・イオン同時計測による準安定OCS^<2+>の生成機構の解明

    金安 達夫, 伊藤 雅大, 副島 浩一, 彦坂 泰正, 繁政 英治

    日本物理学会講演概要集   70   491 - 491   2015年

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    記述言語:日本語   出版者・発行元:一般社団法人日本物理学会  

    DOI: 10.11316/jpsgaiyo.70.2.0_491

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  • Molecular single photon double K-shell ionization 査読

    F. Penent, M. Nakano, M. Tashiro, T. P. Grozdanov, M. Zitnik, S. Carniato, P. Selles, L. Andric, P. Lablanquie, J. Palaudoux, E. Shigemasa, H. Iwayama, Y. Hikosaka, K. Soejima, I. H. Suzuki, N. Kouchi, K. Ito

    JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA   196   38 - 42   2014年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    We have studied single photon double K-shell ionization of small molecules (N-2, CO, C2H2n, (n = 1-3),...) and the Auger decay of the resulting double core hole (DCH) molecular ions thanks to multi-electron coincidence spectroscopy using a magnetic bottle time-of-flight spectrometer. The relative cross-sections for single-site (K-2) and two-site (K-1K-1) double K-shell ionization with respect to single K-shell (K-1) ionization have been measured that gives important information on the mechanisms of single photon double ionization. The spectroscopy of two-site (K-1K-1) DCH states in the C2H2n (n = 1-3) series shows important chemical shifts due to a strong dependence on the C-C bond length. In addition, the complete cascade Auger decay following single site (K-2) ionization has been obtained. (C) 2013 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.elspec.2013.10.002

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  • Lifetime broadening of atomic lines produced upon ultrafast dissociation of HCl and HBr 査読

    P. Lablanquie, H. Iwayama, F. Penent, K. Soejima, E. Shigemasa

    JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA   195   96 - 100   2014年8月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    Ultrafast dissociation of the HCl and HBr molecules excited respectively to the 2p(3/2) -&gt; sigma* and 3d(5/2) -&gt; sigma* resonances are studied with high resolution photoelectron spectroscopy. Sharp vibrational molecular lines and broad atomic lines are observed. The analysis of the profile of the atomic lines gives access to the lifetimes of the inner shell 2p(3/2) hole in the Cl* (2p(3/2))(-1) 3s(2)3p(6) configuration, and the inner shell 3d(5/2) hole in the Br* (3d(5/2))(-1) 4s(2)4p(6) configuration. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.elspec.2014.06.006

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  • Site-specific formation of metastable dications following inner-shell ionization of CO2 査読

    Y. Hikosaka, Y. Shibata, K. Soejima, H. Iwayama, E. Shigemasa

    CHEMICAL PHYSICS LETTERS   603   46 - 50   2014年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    An Auger-electron-ion coincidence method is applied to study the site-specific formation of metastable CO22+ in the C1s and O1s Auger decays of CO2. It is found that only dication states with the electronic configuration of 1 pi(-2)(g) are relevant to the metastable formation. These dication states are favorably produced in the O1s Auger decay, because of the charge distribution of the 1 pi(g) orbital localizing at the O site. Fragmentation channels of dissociative CO22+ states are also investigated. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.cplett.2014.04.030

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  • A high-resolution magnetic bottle electron spectrometer and its application to a photoelectron-Auger electron coincidence measurement of the L2,3VV Auger decay in CS2 査読

    Y. Hikosaka, M. Sawa, K. Soejima, E. Shigemasa

    JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA   192   69 - 74   2014年1月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    The energy resolution and the detection efficiency of a magnetic bottle electron spectrometer equipped with an electrostatic retarder are examined, with a particular focus on its application to electron coincidence measurements. The electrostatic retardation properly improves the energy resolving power of the spectrometer. No significant decrease in detection efficiency is observed when retardation voltages are applied. Photoelectron-Auger electron coincidence measurement of the L2,3VV Auger decay in CS2 is performed by using the magnetic bottle spectrometer, which reveals Auger transition intensities varying for the different core holes. (C) 2014 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.elspec.2014.01.017

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  • Double K-shell ionization in C2H2n(n=1,3), CO and N-2 査読

    M. Nakano, F. Penent, M. Tashiro, T. P. Grozdanov, M. Zitnik, S. Carniato, P. Selles, L. Andric, P. Lablanquie, J. Palaudoux, E. Shigemasa, H. Iwayama, Y. Hikosaka, K. Soejima, I. H. Suzuki, N. Kouchi, K. Ito

    XXVIII INTERNATIONAL CONFERENCE ON PHOTONIC, ELECTRONIC AND ATOMIC COLLISIONS (ICPEAC)   488   2014年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

    We have observed single photon one-site (K-2) and two-sites (K-1K-1) double K-shell ionization in C2H2n (n-1-3) sequence and in isoelectronic C2H2. N-2 and CO molecules. The spectroscopy of K-1K-1 states is much more sensitive to the bond length than conventional ESCA spectroscopy based on single K-shell ionization. The mechanism of single photon two-sites is due to a knock-out process in which a primary photoionized 1s electrons eject another Is electron on the neighbor atom.

    DOI: 10.1088/1742-6596/488/2/022013

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  • Electron reemission processes following photoelectron recapture due to post-collision interaction in inner-shell photoionization of water molecules 査読

    Y. Hikosaka, M. Sawa, M. Nakano, K. Soejima, P. Lablanquie, F. Penent, K. Ito

    JOURNAL OF CHEMICAL PHYSICS   138 ( 21 )   2013年6月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER INST PHYSICS  

    Electron reemission following photoelectron recapture due to post-collision interaction has been studied at 0.7 eV the inner-shell photoionization threshold of water molecules, using a multi-electron coincidence method. Electron reemissions after single Auger decay occur from O and OH fragments which are produced by the dissociations of high-n Rydberg H2O+ states populated through photoelectron recapture. In addition, electron reemissions after double Auger decay are identified in triple coincidence events, where autoionization lines from O and O+ fragments are observed. (C) 2013 AIP Publishing LLC.

    DOI: 10.1063/1.4808028

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  • Single Photon K-2 and K-1K-1 Double Core Ionization in C2H2n (n=1-3), CO, and N-2 as a Potential New Tool for Chemical Analysis 査読

    M. Nakano, F. Penent, M. Tashiro, T. P. Grozdanov, M. Zitnik, S. Carniato, P. Selles, L. Andric, P. Lablanquie, J. Palaudoux, E. Shigemasa, H. Iwayama, Y. Hikosaka, K. Soejima, I. H. Suzuki, N. Kouchi, K. Ito

    PHYSICAL REVIEW LETTERS   110 ( 16 )   2013年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    We have observed single photon double K-shell photoionization in the C2H2n (n = 1-3) hydrocarbon sequence and in N-2 and CO, using synchrotron radiation and electron coincidence spectroscopy. Our previous observations of the K-2 process in these molecules are extended by the observations of a single photon double photoionization with one core hole created at each of the two neighboring atoms in the molecule (K-1K-1 process). In the C2H2n sequence, the spectroscopy of K-1K-1 states is much more sensitive to the bond length than conventional electron spectroscopy for chemical analysis spectroscopy based on single K-shell ionization. The cross section variation for single photon K-1K-1 double core ionization in the C2H2n sequence and in the isoelectronic C2H2, N-2 and CO molecules validates a knockout mechanism in which a primary ionized 1s photoelectron ejects another 1s electron of the neighbor atom. The specific Auger decay from such states is clearly observed in the CO case. DOI: 10.1103/PhysRevLett.110.163001

    DOI: 10.1103/PhysRevLett.110.163001

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  • Communication: Formation of slow electrons in the Auger decay of core-ionized water molecules 査読

    Y. Hikosaka, K. Yamamoto, M. Nakano, T. Odagiri, K. Soejima, I. H. Suzuki, P. Lablanquie, F. Penent, K. Ito

    JOURNAL OF CHEMICAL PHYSICS   137 ( 19 )   2012年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER INST PHYSICS  

    Double Auger decay of O1s(-1) and its satellite states in H2O has been studied with a multi-electron coincidence method, and a process leading to autoionizing O* fragments has been revealed. The breaking of the two O-H bonds producing the autoionizing O* fragments occurs for highly excited H2O2+ populated by the initial Auger decay. The O* fragments are more favorably produced in the decay from the satellite states, resulting from the larger population of highly excited H2O2+ states inheriting the valence excitation in the initial state. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4768213]

    DOI: 10.1063/1.4768213

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  • Auger decay of Ar 2p satellite states studied with a multielectron coincidence method 査読

    M. Nakano, Y. Hikosaka, P. Lablanquie, F. Penent, S-M Huttula, I. H. Suzuki, K. Soejima, N. Kouchi, K. Ito

    PHYSICAL REVIEW A   85 ( 4 )   2012年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    The Auger decay channels of the Ar 2p satellite states have been investigated using a multielectron coincidence technique, using a magnetic bottle time-of-flight electron spectrometer. For the Ar+(2p(-1)3p(-1)np) satellite states the 2p hole is filled first, while for the Ar+(2p(-1)3s(-1)4s) satellite states the 3s hole is filled first with leading to Ar2+(2p(-1)3p(-1)) states, which subsequently undergo an Auger decay leading to the filling of the 2p hole.

    DOI: 10.1103/PhysRevA.85.043405

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  • Single-Photon Core Double Ionization in Molecules. 査読

    P. Lablanquie, F. Penent, J. Palaudoux, L. Andric, P. Selles, S. Carniato, K. Bucar, M. Zitnik, M. Huttula, J. H. D. Eland, E. Shigemasa, K. Soejima, Y. Hikosaka, I. H. Suzuki, M. Nakano, K. Ito

    XXVII INTERNATIONAL CONFERENCE ON PHOTONIC, ELECTRONIC AND ATOMIC COLLISIONS (ICPEAC 2011), PTS 1-15   388   2012年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

    Single photon double K-shell ionization of small molecules (N-2, O-2, CO, CO2) has been observed by coincidence detection of two photoelectrons with two Auger electron and reveals properties of hollow molecules.

    DOI: 10.1088/1742-6596/388/2/022027

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  • Evidence of Single-Photon Two-Site Core Double Ionization of C2H2 Molecules 査読

    P. Lablanquie, T. P. Grozdanov, M. Zitnik, S. Carniato, P. Selles, L. Andric, J. Palaudoux, F. Penent, H. Iwayama, E. Shigemasa, Y. Hikosaka, K. Soejima, M. Nakano, I. H. Suzuki, K. Ito

    PHYSICAL REVIEW LETTERS   107 ( 19 )   2011年11月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    We observe the formation in a single-photon transition of two core holes, each at a different carbon atom of the C2H2 molecule. At a photon energy of 770.5 eV, the probability of this 2-site core double ionization amounts to 1.6 +/- 0.4% of the 1-site core double ionization. A simple theoretical model based on the knockout mechanism gives reasonable agreement with experiment. Spectroscopy and Auger decays of the associated double core hole states are also investigated.

    DOI: 10.1103/PhysRevLett.107.193004

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  • Energy Correlation among Three Photoelectrons Emitted in Core-Valence-Valence Triple Photoionization of Ne 査読

    Y. Hikosaka, P. Lablanquie, F. Penent, J. Palaudoux, L. Andric, K. Soejima, E. Shigemasa, I. H. Suzuki, M. Nakano, K. Ito

    PHYSICAL REVIEW LETTERS   107 ( 11 )   2011年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    The direct observation of triple photoionization involving one inner shell and two valence electrons is reported. The energy distribution of the three photoelectrons emitted from Ne is obtained using a very efficient multielectron coincidence method using the magnetic bottle electron spectroscopic technique. A predominance of the direct path to triple photoionization for the formation of Ne3+ in the 1s2s(2)2p(4) configuration is observed. It is demonstrated that the energy distribution evolves with photon energy and indicates a significant difference with triple photoionization involving only valence electrons.

    DOI: 10.1103/PhysRevLett.107.113005

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  • Decay pathways after Xe 3d inner shell ionization using a multi-electron coincidence technique 査読

    I. H. Suzuki, Y. Hikosaka, E. Shigemasa, P. Lablanquie, F. Penent, K. Soejima, M. Nakano, N. Kouchi, K. Ito

    JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS   44 ( 7 )   2011年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    Cascade Auger electron emission following Xe 3d photoionization has been investigated using a multi-electron coincidence technique, which utilizes an electron spectrometer of magnetic bottle type. It has been found that the Xe2+ states of the 4p(-1)4d(-1) configuration, formed by the Auger decay of the Xe+ 3d(3/2,5/2)(-1) states, dominantly turn into triply charged states of the 4d(-2)5p(-1)/4d(-2)5s(-1) configurations. The Xe2+ 4s(-1)4d(-1) states, formed by the 3d Auger decay, yield the 4p(-1)4d(-1)5p(-1) states as well as the 4d(-3) states. From the coincidence spectrum among three Auger electrons, it is suggested that the Xe2+ 4p(-1)4d(-1) states give rise to the following cascade processes: 4p(-1)4d(-1) -&gt; 4d(-2)5p(-1) -&gt; 4d(-1)5p(-3).

    DOI: 10.1088/0953-4075/44/7/075003

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  • Properties of Hollow Molecules Probed by Single-Photon Double Ionization 査読

    P. Lablanquie, F. Penent, J. Palaudoux, L. Andric, P. Selles, S. Carniato, K. Bucar, M. Zitnik, M. Huttula, J. H. D. Eland, E. Shigemasa, K. Soejima, Y. Hikosaka, I. H. Suzuki, M. Nakano, K. Ito

    PHYSICAL REVIEW LETTERS   106 ( 6 )   2011年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    The formation of hollow molecules (with a completely empty K shell in one constituent atom) through single-photon core double ionization has been demonstrated using a sensitive magnetic bottle experimental technique combined with synchrotron radiation. Detailed properties are presented such as the spectroscopy, formation, and decay dynamics of the N-2(2+) K-2 main and satellite states and the strong chemical shifts of double K holes on an oxygen atom in CO, CO2, and O-2 molecules.

    DOI: 10.1103/PhysRevLett.106.063003

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  • Cross Sections for Single electron capture in collisions of N(2+) with He at low energies 査読

    K. Soejima, S. Tanaka, A. Danjo

    14TH INTERNATIONAL CONFERENCE ON THE PHYSICS OF HIGHLY CHARGED IONS (HCI 2008)   163   2009年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:IOP PUBLISHING LTD  

    The absolute cross sections of single electron capture during the collision of N(2+) with He have been measured over the energy range 0.1-300 eV/u. From the plot showing the dependence of cross sections on energy, the following three remarkable observations can be made: (1) the cross sections exhibit an oscillatory structure below 1eV/u, (2) a bend in the cross sections appears at approximately I eV/u and (3) there is a dip in the cross sections at approximately 70 eV/u. The formation of an oscillatory structure is attributed to the glory effect. The bend in the cross sections occurs owing to the attractive potential part of a 1(2)Pi state of quasimolecule NHe(2+). The dip in the cross sections appears as a result of opening a new reaction path above 70eV/u. The glory effect can be observed for the first time on a total cross section even for slow ion-neutral collisions. The objective of this study is to explore the possibilities of providing a detailed explanation of energy dependence measurements in order to study reaction dynamics for a charge changing process.

    DOI: 10.1088/1742-6596/163/1/012056

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  • Angular distributions of vibrationally-resolved C 1s photoelectrons from fixed-in-space CO molecules: vibrational effect in the shape-resonant C 1s photoionization of CO 査読

    J Adachi, K Hosaka, S Furuya, K Soejima, M Takahashi, A Yagishita, SK Semenov, NA Cherepkov

    JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA   137   243 - 248   2004年7月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ELSEVIER SCIENCE BV  

    We have measured vibrationally-resolved molecular-frame photoelectron angular distributions (MF-PAD) from the C 1s level of CO molecules in the sigma shape resonance region. The MF-PAD's for vibrational levels (v(f) = 0, 1, and 2) in the C 1s --&gt; epsilonlsigma channel are apparently different one from another at each incident photon energy. These experimental MF-PAD's agree with the present theoretical results from averaging the nuclear distance dependent dipole matrix elements with the relaxed core Hartree-Fock calculations. The results show that the MF-PAD's sensitively depend on the vibrational levels. This means that the internuclear distance dependences of phases and of magnitudes of dipole matrix elements play a crucial role in the C 1s photoionization of CO. (C) 2004 Elsevier B.V. All rights reserved.

    DOI: 10.1016/j.elspec.2004.02.043

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  • Elastic scattering of low energy electrons from ozone molecules 査読

    T Ono, E Shimaki, Y Kojima, Y Kiyama, T Takahasi, K Soejima, A Danjo

    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   73 ( 4 )   892 - 897   2004年4月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:PHYSICAL SOC JAPAN  

    Differential cross sections have been measured for vibrationally elastic scattering of electrons from ozone molecules at incident electron energies from 2 eV to 10 eV in the angular range from 20degrees to 120degrees. Absolute values of the differential cross sections have been obtained by means of the relative flow method. Integral and momentum transfer cross sections have been derived from the measured data by extrapolating to 0degrees and 180degrees scattering angles. Comparison was made between the present measurements and those from other experiments and theoretical calculations.

    DOI: 10.1143/JPSJ.73.892

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  • Shape-resonance-enhanced vibrational effects in the angular distributions of C 1s photoelectrons from fixed-in-space CO molecules 査読

    J Adachi, K Hosaka, S Furuya, K Soejima, M Takahashi, A Yagishita, SK Semenov, NA Cherepkov

    PHYSICAL REVIEW LETTERS   91 ( 16 )   2003年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMERICAN PHYSICAL SOC  

    Angular distributions of C 1s photoelectrons from fixed-in-space CO molecules have been measured with vibrational resolution. A strong dependence of the angular distributions on the vibrational states of the residual molecular ion has been found for the first time in the region of the shape resonance. Calculations in the relaxed core Hartree-Fock approximation have reproduced the angular distributions fairly well in the general shapes of the angular distributions due to the correct description of nuclear motion as an average of the internuclear-distance-dependent dipole amplitudes.

    DOI: 10.1103/PhysRevLett.91.163001

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  • Complete photoionization experiment in the region of the 2 delta(g) -&gt; delta(u) shape resonance of the N(2) molecule 査読

    S Motoki, J Adachi, K Ito, K Ishii, K Soejima, A Yagishita, SK Semenov, NA Cherepkov

    JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS   35 ( 18 )   3801 - 3819   2002年9月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    Angular distributions of photoelectrons (ADPs) from the 2sigma(g) shell of a fixed-in-space N(2) molecule have been measured for left- and right-elliptically polarized, as well as for linearly polarized, light. From these data a set of dipole matrix elements and phase shift differences characterizing the process has been determined taking into account the acceptance angles of both electron and ion detectors, i.e. the complete experiment has been performed. Good agreement between the experimental and the relevant theoretical values calculated in the random phase approximation is obtained. Based on the results of the complete experiment, three-dimensional ADPs and ions are predicted for different light polarizations.

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  • Double photoionization of helium at an excess energy of 60 eV using left- and right-elliptically-polarized light 査読

    SA Collins, S Cvejanovic, C Dawson, TJ Reddish, DP Seccombe, A Huetz, L Malegat, P Selles, AK Kazansky, A Danjo, K Soejima, K Okuno, A Yagishita

    PHYSICAL REVIEW A   65 ( 5 )   2002年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMERICAN PHYSICAL SOC  

    Helium double photoionization (gamma,2e) triple differential cross sections (TDCSs) were measured at an excess energy of 60 eV using a dual toroidal spectrometer and synchrotron radiation from a helical undulator (BL-28A, Photon Factory, Japan). Energy-sharing ratios (R=E-2/E-1) for the two ejected electrons of 5 and 11 are studied with both right- and left-handed elliptically polarized light. The TDCSs are found to be in good agreement with those obtained using the hyperspherical R matrix with semiclassical outgoing waves theory. The circular dichroism for a limited mutual angular range (phi(12)approximate to110degrees-200degrees) is determined from the experimental data for both R=5 and 11, and compared to theoretical calculations performed over the complete range of mutual angles. No dynamic nodes are found in either the experimental (within the explored phi(12) range) or theoretical circular dichroism for these R values at this excess energy.

    DOI: 10.1103/PhysRevA.65.052717

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  • Direct probe of the shape resonance mechanism in 2 sigma(g)-shell photoionization of the N-2 molecule 査読

    S Motoki, J Adachi, K Ito, K Ishii, K Soejima, A Yagishita, SK Semenov, NA Cherepkov

    PHYSICAL REVIEW LETTERS   88 ( 6 )   2002年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMERICAN PHYSICAL SOC  

    Angular distributions of photoelectrons from a 2sigma g shell of fixed-in-space N-2 molecules have been measured for left- and right-elliptically polarized and for linearly polarized light at several photon energies in the region of sigma* shape resonance. That allowed the determination of a set of dipole matrix elements and phase shift differences characterizing the process. These data clearly show the enhancement of the f sigma(u) partial cross section in the resonance simultaneously with an abrupt increase of the corresponding phase shift by pi, which is the first experimental demonstration of the nature of the sigma* shape resonance in homonuclear diatomic molecules.

    DOI: 10.1103/PhysRevLett.88.063003

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  • Chiral electron pairs in photodouble ionization of helium 査読

    K Soejima

    CORRELATIONS, POLARIZATION, AND IONIZATION IN ATOMIC SYSTEMS   604   178 - 183   2002年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Triple differential cross sections (TDCSs) of tile two ejected chiral electrons from helium were measured for several kinematic conditions using circularly polarized synchrotron radiation at tile Photon Factory. The selected kinematic conditions were E=9 eV (R=2,8), E=40 eV (R=7, 19) and E=50 eV (R=24), where E is the excess energy and R is the ratio of the kinetic energy of the ejected electrons. The changes in the TDCSs with "E" and "R" are presented. The gerade (a(g)) and ungerade (a(u)) dipole amplitudes were determined using four parameters parametrization. The "E" and "R" dependences of the four parameters of a(g) and a(u) arc also presented.

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  • Direct Probe of the Shape Resonance Mechanism in [Formula presented]-Shell Photoionization of the [Formula presented] Molecule 査読

    S. Motoki, J. Adachi, A. Yagishita, J. Adachi, K. Ito, A. Yagishita, N. A. Cherepkov, K. Ishii, K. Soejima, S. K. Semenov, N. A. Cherepkov

    Physical Review Letters   88 ( 6 )   4   2002年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)  

    Angular distributions of photoelectrons from a [Formula presented] shell of fixed-in-space [Formula presented] molecules have been measured for left- and right-elliptically polarized and for linearly polarized light at several photon energies in the region of [Formula presented] shape resonance. That allowed the determination of a set of dipole matrix elements and phase shift differences characterizing the process. These data clearly show the enhancement of the [Formula presented] partial cross section in the resonance simultaneously with an abrupt increase of the corresponding phase shift by [Formula presented], which is the first experimental demonstration of the nature of the [Formula presented] shape resonance in homonuclear diatomic molecules. © 2002 The American Physical Society.

    DOI: 10.1103/PhysRevLett.88.063003

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  • Triply differential cross-section measurements in the double photoionization of D-2 and He with asymmetric kinematic conditions 査読

    SA Collins, A Huetz, TJ Reddish, DP Seccombe, K Soejima

    PHYSICAL REVIEW A   64 ( 6 )   2001年12月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMER PHYSICAL SOC  

    The breakup of D-2 following the absorption of a single photon, leading to four free charged particles interacting via the Coulomb force, has been investigated. Triply differential cross sections (TDCSs) of the two ejected electrons were measured for selected asymmetric kinematic conditions, namely, a 20 eV electron in coincidence with a 5 eV "reference" electron fixed at four different angles. The results are compared with helium TDCSs and, although the respective angular distributions have similar features, there are surprising differences that could have their origin in two-center interference effects.

    DOI: 10.1103/PhysRevA.64.062706

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  • K-shell photoionization of CO: I. Angular distributions of photoelectrons from fixed-in-space molecules 査読

    S Motoki, J Adachi, Y Hikosaka, K Ito, M Sano, K Soejima, A Yagishita, G Raseev, NA Cherepkov

    JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS   33 ( 20 )   4193 - 4212   2000年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    Angular distributions of photoelectrons from both C and O K-shells of the fixed-in-space CO molecule have been measured using the angle-resolved photoeletron-photoion coincidence technique. The measurements have been performed at several photon energies from the ionization thresholds up to about 30 eV above them, where the sigma* shape resonances occur. Experimental results are compared with the multiple-scattering calculations of Diil et al (1976 J. Chem. Phys. 65 3158) and with our new calculations in the relaxed-core Hartree-Fock approximation. Our calculations are in a better agreement with the experimental data though numerical discrepancies remain. The experimental angular distributions are fitted by the expansion in Legendre polynomials containing up to ten terms and the extracted parameters are compared with the corresponding theoretical values.

    DOI: 10.1088/0953-4075/33/20/301

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  • K-shell photoionization of CO: II. Determination of dipole matrix elements and phase differences 査読

    NA Cherepkov, G Raseev, J Adachi, Y Hikosaka, K Ito, S Motoki, M Sano, K Soejima, A Yagishita

    JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS   33 ( 20 )   4213 - 4236   2000年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    Using the experimental angular distributions of photoelectrons from the K-shells of an oriented CO molecule reported in a companion paper, we have performed a so-called complete experiment and determined 18 dynamical parameters (ten moduli of transition moments and eight phase differences) for the O K-shell, and 16 dynamical parameters (nine moduli of transition moments and seven phase differences) for the C K shell, and compared them with the results of our calculations in the relaxed-core Hartree-Fock (RCHF) approximation. The agreement between theory and experiment is only qualitative, therefore the model has to be improved by including electron correlations. From the analysis of experimental data we proved that the sigma* shape resonance is due to not only the f-wave, as was widely believed earlier, but is due to approximately equal contributions of three partial waves with 1 less than or equal to l less than or equal to 3 for the C R-shell, and four partial waves with 0 less than or equal to l less than or equal to 3 for the O K-shell, with a rather substantial contribution of other partial waves with I less than or equal to 5. From the analysis of the transition moments determined from the experiment it follows that several Cooper minima are likely to exist in partial photoionization cross sections, in particular, in the C 1s sigma --&gt; epsilons sigma and in the O 1s sigma --&gt; epsilond sigma transitions.

    DOI: 10.1088/0953-4075/33/20/302

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  • Photoelectron angular distributions from dissociative photoionization channels of fixed-in-space molecular hydrogen 査読

    K Ito, J Adachi, R Hall, S Motoki, E Shigemasa, K Soejima, A Yagishita

    JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS   33 ( 3 )   527 - 533   2000年2月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    The angular distribution of photoelectrons from fixed-in-space molecular hydrogen has been measured in the 44-76 eV photon energy range for an ionic state, with a state energy of 38 eV measured from the H-2 ground state, dissociating to H+ + H(n = 2). The photoelectrons are ejected nearly isotropically at 44 eV when their energy is relatively low, while ejection perpendicular to the molecular axis becomes more and more favoured as the photon energy increases. This behaviour is possibly explained in terms of direct photoionization to the 2p pi(u), and 2s sigma(g) states of H-2(+); the former being favoured at 44 eV, and the latter at photon energies far from threshold.

    DOI: 10.1088/0953-4075/33/3/320

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  • Circular dichroism of angular correlation patterns in two-step and direct double photoionization 査読

    K Soejima

    PHYSICS OF ELECTRONIC AND ATOMIC COLLISIONS   500   136 - 145   2000年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AMER INST PHYSICS  

    Angular correlation patterns of N-5-O23O23 S-1(0) Auger electrons in coincidence with 4d(5/2) photoelectrons in two-step double photoionization of xenon and those of two emitted photoelectrons in coincidence with each other in direct double photoionization of helium have been studied with elliptically polarized photons. Circular dichroism in the angular distribution patterns has been reported in both cases.

    DOI: 10.1063/1.1302646

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  • Dynamic properties of N and O 1s(-1) sigma u* shape resonances in N-2 and CO2 molecules 査読

    AA Pavlychev, NG Fominykh, N Watanabe, K Soejima, E Shigemasa, A Yagishita

    PHYSICAL REVIEW LETTERS   81 ( 17 )   3623 - 3626   1998年10月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:AMERICAN PHYSICAL SOC  

    An essential correlation between intramolecular interference of photoelectron waves and core-hole molecular relaxation is revealed by analyzing the partial wave composition of the calculated angular distribution of photoelectrons in the N and O 1s(-1)sigma(u)* shape resonances of aligned N-2 and CO2. The dominance of coherent (N-2) and incoherent (CO2) interference is revealed, pf and spd hybridization controls the main direction of photoelectron emission from the N and O K shell, respectively. [S0031-9007(98)07498-5].

    DOI: 10.1103/PhysRevLett.81.3623

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  • High-resolution spherical grating monochromator for the undulator beamline (BL-16B) at the Photon Factory 査読

    E Shigemasa, A Toyoshima, YL Yan, T Hayaishi, K Soejima, T Kiyokura, A Yagishita

    JOURNAL OF SYNCHROTRON RADIATION   5   777 - 779   1998年5月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:WILEY-BLACKWELL  

    The design and performance of a 24 m high-resolution spherical grating monochromator (H-SGM) for the undulator beamline (BL-16B) at the Photon Factory are described. With three interchangeable gratings of 400, 900 and 2000 lines mm(-1), the H-SGM is designed to cover the photon energy range 40-600 eV. With a resolving power of approximately 2000 in the photon energy range 40-530 eV, more than 10(11) photons s(-1) have been measured. The best resolutions obtained so far, at a substantially lower photon flux, are greater than 10 000 at 250 eV and 8000 at 400 eV.

    DOI: 10.1107/S0909049597019791

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  • First observation of circular dichroism in angular correlation patterns for two-step double and direct double photoionization of xenon 査読

    K Soejima, M Shimbo, A Danjo, K Okuno, E Shigemasa, A Yagishita

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY   32 ( 3 )   368 - 372   1998年3月

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:KOREAN PHYSICAL SOC  

    Angular correlation patterns of N-5-O23O23 S-1(0) Auger electrons in coincidence with 4d(5/2) photoelectrons in the two-step double photoionization of xenon and those of two outgoing 5p photoelectrons in coincidence with each other in the direct double photoionization of xenon were measured with a circularly polarized photon beam from a helical undulator. Circular dichroism was clearly observed in both cases. For the two-step process, the experimental data were in good agreement with the theoretical prediction based on the two-step model.

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  • Mini-EBIS report on electron capture in slow collisions of multiply charged ions with neutral targets 査読

    K Okuno, H Saitoh, K Soejima, SD Kravis, N Kobayashi

    PHYSICA SCRIPTA   T71   140 - 146   1997年

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    記述言語:英語   掲載種別:研究論文(学術雑誌)   出版者・発行元:ROYAL SWEDISH ACAD SCIENCES  

    The status of cross section measurements carried out with a Mini-EBIS- is reported, here. Single- and multiple-electron transfer processes in collisions of Arq+ (q = 6, 7, 8, 9, and 11) with H-2 and He, and those of C4+ with Ne, Ar and Kr have been investigated at low energies ranging from 0.075 eV/amu to 275 eV/amu and from 0.33 eV/amu to 667 eV/amu, respectively. All data of single-electron transfer cross sections measured for Arq+ -H-2 and -He systems shows a similar tendency to converge toward the Langevin cross section at the low energy end. In the C4+ -Ne system, double-electron transfer is predominant at high energies and it is dominated by the backward scattering at low energies. From the observation of recoil ions produced in C4+ -Ar and -Kr collisions, it is found that the angular distribution of the multiple-electron transfer collisions shifts toward the backward direction in the center-of-mass frame with decreasing collision energy and four-electron transfer processes take place. The importance of the orbiting effect due to the polarization force and the backward scattering are enhanced in the single- and multiple-electron transfer collisions of highly charged ions at low energies.

    DOI: 10.1088/0031-8949/1997/T71/026

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  • Molecular shape resonances studied by Angle-resolved PEPICO 査読

    E. Shigemasa, J. Adachi, N. Watanabe, K. Soejima, A. Yagishita

    Eds. A. Yagishita and T. Sasaki: Atomic and Molecular Photoionization, Universal Academy Press, INC.   69 - 78   1996年

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    記述言語:英語  

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  • Measurements of charge transfer cross sections for Ar-q+ (q=6, 7, 8, 9 and 11) collisions with He and H-2 targets at low energies 査読

    K Okuno, H Saitoh, K Soejima, S Kravis, N Kobayashi

    PHYSICS OF ELECTRONIC AND ATOMIC COLLISIONS   ( 360 )   867 - 876   1995年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AIP PRESS  

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  • SINGLE AND DOUBLE-CHARGE-EXCHANGE CROSS-SECTIONS FOR ARQ++H(2) (Q=6,7 AND 8) FROM 6EV TO 8KEV 査読

    S KRAVIS, M OURA, Y AWAYA, K OKUNO, H SAITOH, K SOEJIMA, Y KANEKO

    6TH INTERNATIONAL CONFERENCE ON THE PHYSICS OF HIGHLY CHARGED IONS   274   128 - 131   1993年

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    記述言語:英語   掲載種別:研究論文(国際会議プロシーディングス)   出版者・発行元:AIP PRESS  

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  • 近赤外フェムト秒レーザーイオン化によるMALDIプルーム組成の解明および「準熱平衡モデル」に基づく数値シミュレーション

    城田起郎, 柘植雅士, 彦坂泰正, 副島浩一, 星名賢之助

    質量分析総合討論会講演要旨集   65th   198   2017年5月

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    日本物理学会講演概要集   69 ( 2 )   87 - 87   2014年8月

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    記述言語:日本語   出版者・発行元:一般社団法人日本物理学会  

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  • フェムト秒レーザーイオン化によるMALDIプルーム中の中性種の検出

    城田起郎, 城田起郎, 彦坂泰正, 副島浩一, 星名賢之助

    分子科学討論会講演プログラム&amp;要旨(Web)   8th   ROMBUNNO.1P019 (WEB ONLY)   2014年

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  • 25aGL-6 多電子コインシデンス分光法による分子の内殻二重空孔状態の研究(25aGL 原子分子(放射光・FEL・レーザー場),領域1(原子・分子,量子エレクトロニクス,放射線物理))

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    日本物理学会講演概要集   66 ( 1 )   160 - 160   2011年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本物理学会  

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  • 25aRA-4 低エネルギー多価イオンの電荷移行反応 : III. W^<q+>-He(q=4.5.6)(25aRA 融合セッション(原子分子・放射線)(多価イオン),領域1(原子・分子,量子エレクトロニクス,放射線物理))

    佐藤 未穂, 加藤 智帆美, 彦坂 泰正, 副島 浩一

    日本物理学会講演概要集   66 ( 1 )   164 - 164   2011年3月

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  • 25aGL-7 多電子同時計測による水分子の内殻空孔状態の崩壊過程の研究(25aGL 原子分子(放射光・FEL・レーザー場),領域1(原子・分子,量子エレクトロニクス,放射線物理))

    山本 恭子, 彦坂 泰正, 副島 浩一, 中野 元善, 小田切 丈, 鈴木 功, 伊藤 健二

    日本物理学会講演概要集   66 ( 1 )   160 - 160   2011年3月

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  • 23pTC-6 多電子コインシデンス法によるXe3dオージェ終状態からの電子放出過程(23pTC 原子分子,領域1(原子・分子,量子エレクトロニクス,放射線物理))

    鈴木 功, 彦坂 泰正, 繁政 英治, 副島 浩一, 中野 元善, Lablanquie P., Penent F., 伊藤 健二

    日本物理学会講演概要集   65 ( 1 )   218 - 218   2010年3月

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  • 30aSL-5 低エネルギー多価イオンの電荷移行反応 : I.F^<q+>(q=2,3,4)-He(30aSL 原子分子,領域1(原子・分子,量子エレクトロニクス,放射線物理))

    副島 浩一, 戸井田 圭輔, 檀上 篤徳

    日本物理学会講演概要集   64 ( 1 )   183 - 183   2009年3月

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  • 27pXN-7 内殻光電離形状共鳴における分子座標系光電子角度分布に対する分子振動効果(原子・分子)(領域1)

    足立 純一, 穂坂 綱一, 古屋 周作, 副島 浩一, 高橋 正彦, 柳下 明, Semenov Sergei K., Cherepkov Nikolai A.

    日本物理学会講演概要集   59 ( 1 )   157 - 157   2004年3月

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  • Direct probe of the shape resonance mechanism in 2 sigma(g)-shell photoionization of the N-2 molecule

    S Motoki, J Adachi, K Ito, K Ishii, K Soejima, A Yagishita, SK Semenov, NA Cherepkov

    PHYSICAL REVIEW LETTERS   88 ( 6 )   1   2002年2月

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    記述言語:英語   出版者・発行元:AMERICAN PHYSICAL SOC  

    Angular distributions of photoelectrons from a 2sigma g shell of fixed-in-space N-2 molecules have been measured for left- and right-elliptically polarized and for linearly polarized light at several photon energies in the region of sigma* shape resonance. That allowed the determination of a set of dipole matrix elements and phase shift differences characterizing the process. These data clearly show the enhancement of the f sigma(u) partial cross section in the resonance simultaneously with an abrupt increase of the corresponding phase shift by pi, which is the first experimental demonstration of the nature of the sigma* shape resonance in homonuclear diatomic molecules.

    DOI: 10.1103/PhysRevLett.88.063003

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  • He原子の光二重電離‐カイラル電子対の生成‐

    副島 浩一, 柳下 明

    日本物理学会   57 ( 6 )   408 - 412   2002年

  • 28pZF-5 配向N_2分子からの2σg光電子の角度分布測定による光電離の完全実験

    柳下 明, 元木 創平, 足立 純一, 伊藤 健二, 石井 邦和, 副島 浩一

    日本物理学会講演概要集   56 ( 1 )   121 - 121   2001年3月

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  • Photoelectron angular distributions from OK shell of oriented CO molecules: A critical comparison between theory and experiment

    K Ito, J Adachi, Y Hikosaka, S Motoki, K Soejima, A Yagishita, G Raseev, NA Cherepkov

    PHYSICAL REVIEW LETTERS   85 ( 1 )   46 - 49   2000年7月

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    記述言語:英語   出版者・発行元:AMERICAN PHYSICAL SOC  

    The dynamical information (ten dipole matrix elements and eight phase differences) has been deduced from the measured angular distributions of photoelectrons from O K shell of oriented CO molecules near the ionization threshold in the region of a sigma* shape resonance. Light polarization parallel and perpendicular to the molecular axis has been used. An important contribution of six l sigma partial waves with 0 less than or equal to l less than or equal to 5 to the sigma* shape resonance is demonstrated. A comparison with our calculations in the relaxed core Hartree-Fock approximation reveals only a qualitative agreement, therefore a more advanced theory is needed.

    DOI: 10.1103/PhysRevLett.85.46

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  • 24aF-10 CO分子のO-K殻光電離の完全実験

    元木 創平, 足立 純一, 彦坂 泰正, 伊藤 健二, 副島 浩一, 佐野 睦, 柳下 明, Raseev G., Cherepkov N. A.

    日本物理学会講演概要集   55 ( 1 )   107 - 107   2000年3月

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  • 二重光電離過程にあらわれる円二色性

    日本放射光学会   13 ( 1 )   40   2000年

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  • Experimental and theoretical study of linear and circular dichroism in helium double photoionization

    A Kheifets, Bray, I, K Soejima, A Danjo, K Okuno, A Yagishita

    JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS   32 ( 17 )   L501 - L509   1999年9月

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    The fully resolved triply differential cross section (TDCS) of helium double photoionization with elliptically polarized light has been determined, both experimentally and theoretically, at the photon energy of 88 eV. The excess energy was shared between the photoelectron pair as 1 + 8, 3 + 6 and 4.5 + 4.5 eV. Simultaneous sign reversal of the Stokes parameters S-1, S-3 resulted in a profound change of shape of the TDCS. This effect can be attributed to the linear dichroism in the case of equal energy sharing, and a combination of the circular and linear dichroisms in the case of unequal energy sharing. Theoretical TDCS was obtained by employing the convergent close-coupling (CCC) method. In contrast to the previous work of Mergel et al (1998 Phys. Rev. Lett. 80 5301) who investigated the circular dichroism at 99 eV photon energy, good agreement is found between experimental and calculated TDCS in all cases.

    DOI: 10.1088/0953-4075/32/17/104

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  • Linear and circular dichroism in the double photoionization of helium

    K Soejima, A Danjo, K Okuno, A Yagishita

    PHYSICAL REVIEW LETTERS   83 ( 8 )   1546 - 1549   1999年8月

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    記述言語:英語   出版者・発行元:AMER PHYSICAL SOC  

    Energy- and angle-resolved triply differential cross sections have been measured in the double photoionization of helium under equal and unequal energy sharing conditions using right- and left-elliptically polarized photons. Linear dichroism in these cross sections has been observed under the equal energy sharing. For the unequal energy sharing a pure circular polarization effect has been deduced by eliminating the linear polarization contribution.

    DOI: 10.1103/PhysRevLett.83.1546

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  • 29a-ZC-7 空間に配向したCOからのCls, Ols光電子角度分布:測定と理論との比較

    元木 創平, 彦坂 泰正, 佐野 睦, 副島 浩一, 足立 純一, 柳下 明, 伊藤 健二

    日本物理学会講演概要集   54 ( 1 )   750 - 750   1999年3月

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  • 29a-ZC-6 CO_2内殻電離に伴う分子振動のOls光電子角度分布への影響

    伊藤 健二, 彦坂 泰正, 元木 創平, 佐野 睦, 渡部 直樹, 繁政 英治, 副島 浩一, 足立 純一, 柳下 明

    日本物理学会講演概要集   54 ( 1 )   750 - 750   1999年3月

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  • Angular Distributions of photoelectrons from Fixed-in space CO Molecules for the Parallel Transitions

    MOTOKI Sohei, HIKOSAKA Yasumasa, FUJITA Yoshihiro, ADACHI Jun-ichi, SANO Mutsumi, SOEJIMA Kou-ichi, YAGISHITA Akira, ITO Kenji

    Atomic collision research in Japan   24   110 - 110   1998年11月

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  • 27a-YR-10 Ar多価イオンとN_2分子衝突におけるN_2分子の解離過程

    小熊 好弘, 小沼 洋一, 小野 珠世, 小島 靖彦, 西村 彰, 山口 竜也, 副島 浩一, 檀上 篤徳, 吉野 益弘

    日本物理学会講演概要集   53 ( 2 )   888 - 888   1998年9月

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  • 25a-L-11 Heの直接二重光電離にあらわれる円および線二色性

    副島 浩一, 小熊 好弘, 檀上 篤徳, 奥野 和彦, 柳下 明

    日本物理学会講演概要集   53 ( 2 )   872 - 872   1998年9月

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  • 25p-L-2 空間に配向したCO分子からの光電子角度分布(I) : 平行遷移

    元木 創平, 彦坂 泰正, 藤田 欣宏, 足立 純一, 佐野 睦, 副島 浩一, 柳下 明, 伊藤 健二

    日本物理学会講演概要集   53 ( 2 )   873 - 873   1998年9月

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  • First observation of circular dichroism in angular correlation patterns for two-step double and direct double photoionization of xenon

    K Soejima, M Shimbo, A Danjo, K Okuno, E Shigemasa, A Yagishita

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY   32 ( 3 )   368 - 372   1998年3月

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    記述言語:英語   出版者・発行元:KOREAN PHYSICAL SOC  

    Angular correlation patterns of N-5-O23O23 S-1(0) Auger electrons in coincidence with 4d(5/2) photoelectrons in the two-step double photoionization of xenon and those of two outgoing 5p photoelectrons in coincidence with each other in the direct double photoionization of xenon were measured with a circularly polarized photon beam from a helical undulator. Circular dichroism was clearly observed in both cases. For the two-step process, the experimental data were in good agreement with the theoretical prediction based on the two-step model.

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  • Direct determination of partial wave contributions in the sigma* shape resonance of CO molecules

    E Shigemasa, J Adachi, K Soejima, N Watanabe, A Yagishita, NA Cherepkov

    PHYSICAL REVIEW LETTERS   80 ( 8 )   1622 - 1625   1998年2月

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    記述言語:英語   出版者・発行元:AMERICAN PHYSICAL SOC  

    The first complete experiment for the C K-shell of CO molecules in the region of the sigma* shape resonance has been performed by detecting photoelectrons in coincidence with fragment ions. Four ratios of dipole matrix elements and four phase shift differences have been extracted from the experi mental data. Their analyses show that, in the sigma* shape resonance due to the l mixing, d and f partial waves give the main contribution to the cross section, and f and g waves give the main contribution to a rapid increase of phase shift by pi.

    DOI: 10.1103/PhysRevLett.80.1622

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  • Fixed-molecule 1s sigma(g,u) photoelectron angular distributions as a probe of sigma(g)* and sigma(u)* shape resonances of CO2

    N Watanabe, J Adachi, K Soejima, E Shigemasa, A Yagishita, NG Fominykh, AA Pavlychev

    PHYSICAL REVIEW LETTERS   78 ( 26 )   4910 - 4913   1997年6月

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    記述言語:英語   出版者・発行元:AMERICAN PHYSICAL SOC  

    Angular distributions of 1s sigma(g,u), photoelectrons from CO2 molecules, oriented parallel to the electric vector of incident light, have been measured. The angular distribution patters at sigma(g)* and sigma(u)* shape resonances are significantly different. From those expected in the virtual molecular orbitals concept. The analyses of the patterns have made it clear that the mixing of outgoing photoelectron partial waves and the interference between them are responsible for the observed patterns, unlike N-2 photoionization. Calculations based on a quasiatomic model bare reproduced the observed patterns fairly well.

    DOI: 10.1103/PhysRevLett.78.4910

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  • Experimental evidence of the d and f waves predominant contribution to the σ<sup>*</sup> shape resonance in CO molecules(共著)

    Physical Review Letters   1997年

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  • First observation of circular dichroism in angular correlation patterns for two-step and direct double photoionization of xenon(共著)

    Journal of Korean Physical Society   1997年

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  • Circular dichroism in fragmentation patterns for two-step double photoionization of Xe

    K Soejima, M Shimbo, A Danjo, K Okuno, E Shigemasa, A Yagishita

    JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS   29 ( 9 )   L367 - L371   1996年5月

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    記述言語:英語   掲載種別:速報,短報,研究ノート等(学術雑誌)   出版者・発行元:IOP PUBLISHING LTD  

    The angular correlation between 4d(5/2) photo- and N-5-O23O23 S-1(0) Anger electrons in xenon has been measured for right and left circularly polarized light with 110 eV energy. Thanks to the high degree of circular polarization of the helical undulator radiation, the circular dichroism in the angular correlation has been clearly observed.

    DOI: 10.1088/0953-4075/29/9/003

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  • 30p-YA-4 低エネルギー多価イオンの電荷移行反応XIV Ar^<6+>+Ne

    斎藤 博樹, 鈴木 健, 副島 浩一, 奥野 和彦, 小林 信夫

    日本物理学会講演概要集. 秋の分科会   1995 ( 4 )   61 - 61   1995年9月

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  • 27p-YA-6 Xe内殻電離における円二色性

    副島 浩一, 新保 宗史, 檀上 徳篤, 奥野 和彦, 繁政 英治, 柳下 明

    日本物理学会講演概要集. 秋の分科会   1995 ( 4 )   24 - 24   1995年9月

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  • SINGLE-CHARGE-EXCHANGE AND DOUBLE-CHARGE-EXCHANGE CROSS-SECTIONS FOR AR-Q++H-2 (Q=6, 7, 8, 9, AND 11) COLLISIONS FROM 6 EV TO 11 KEV

    S KRAVIS, H SAITOH, K OKUNO, K SOEJIMA, M KIMURA, SHIMAMURA, I, Y AWAYA, Y KANEKO, M OURA, N SHIMAKURA

    PHYSICAL REVIEW A   52 ( 2 )   1206 - 1212   1995年8月

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    記述言語:英語   出版者・発行元:AMERICAN PHYSICAL SOC  

    The cross sections for single-electron capture, including transfer ionization, and for double-electron capture, have been measured for Ar-q+ + HL for q = 6, 7, 8, 9, and 11 with projectile energies from q eV to q keV. Theoretically, the cross sections for Ar6+ and Ar8+ impact were calculated using a molecular-orbital expansion method in the energy region from 240 eV to 80 keV, and are in good agreement with experiment. The single-electron-capture cross sections were found to be more than one order of magnitude larger than those for double capture in both experiment and theory. The single-electron-capture cross sections were also compared to the Langevin cross section, a scaling law developed by Muller and Salzborn [Phys. Lett. 62A, 391 (1977)], and the absorbing sphere model.

    DOI: 10.1103/PhysRevA.52.1206

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  • 28p-YR-3 低エネルギー多価イオンの電荷移行反応XIII. C^<4+>+Ne, Ar, Kr

    斎藤 博樹, 副島 浩一, 奥野 和彦, 小林 信夫

    日本物理学会講演概要集. 年会   50 ( 4 )   26 - 26   1995年3月

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  • Mini-EBIS reports on slow electron capture collisions of multiply charged ions(共著)

    Physica Scripta   T59   440   1995年

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  • 4p-L-7 Xe4d光電子とオージェ電子との同時計測

    副島 浩一, 新保 宗史, 奥野 和彦, 壇上 篤徳, 繁政 英治, 柳下 明

    日本物理学会講演概要集. 秋の分科会   1994 ( 4 )   57 - 57   1994年8月

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  • 4a-L-2 低エネルギー多価イオンの電荷移行反応 XII Ar^<q+>+N_2(q=6, 7, 8)

    斎藤 博樹, 副島 浩一, 奥野 和彦, 小林 信夫

    日本物理学会講演概要集. 秋の分科会   1994 ( 4 )   48 - 48   1994年8月

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  • 30p-F-9 低エネルギー多価イオンの電荷移行反応XI(C^<4+>+Ar, Kr)

    齋藤 博樹, 副島 浩一, 奥野 和彦, 小林 信夫

    日本物理学会講演概要集. 年会   49 ( 4 )   54 - 54   1994年3月

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  • 30a-L-9 低エネルギー多価イオンの電荷移行反応IX. : Ar^6+He衝突における電子捕獲断面積(原子・分子)

    副島 浩一, 斉藤 博樹, 奥野 和彦, 金子 洋三郎

    日本物理学会講演概要集. 年会   48 ( 4 )   39 - 39   1993年3月

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  • Multi‐electron‐capture processes by C4+ from CH4, C2H6, C3H8 and n‐C4H10 in the energy range 0.7–400 eV u−1

    K. Soejima, K. Okuno, Y. Kaneko

    Organic Mass Spectrometry   28 ( 4 )   344 - 348   1993年

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    記述言語:英語  

    Charge‐changing cross‐sections σ43, σ42 and σ41 of C4+ injected into CH4, C2H6, C3H8 and n‐C4H10 were measured in the energy range 0.7–400 eV u−1. A tandem mass spectrometer system with an ion source of the EBIS type (Mini‐EBIS) and a collision cell consisting of an octupole ion beam guide was used. It is a significant feature that both the magnitude and energy dependence of the cross‐sections obtained showed very little target dependence for all the hydrocarbon targets studied. Another feature is that σ41 is very close to σ42, and they become flat at low energy, in contrast to the case with an argon target which was studied as a reference. This implies that multi‐electron‐capture processes become dominant in low‐energy collisions with hydrocarbon molecules. Copyright © 1993 John Wiley &amp
    Sons Ltd.

    DOI: 10.1002/oms.1210280414

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  • 27a-ZK-2 低エネルギー多価イオンの電荷移行反応 VIII. Ar^<2+>-H_2(q=6-8)

    奥野 和彦, Kravis Scott, 斉藤 博樹, 副島 浩一, 金子 洋三郎

    秋の分科会講演予稿集   1992 ( 4 )   40 - 40   1992年9月

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  • CROSS-SECTIONS FOR SINGLE AND MULTIPLE ELECTRON-CAPTURE IN LOW-ENERGY COLLISIONS OF C-4+ WITH H-2, O-2 AND N-2

    K SOEJIMA, CJ LATIMER, K OKUNO, N KOBAYASHI, Y KANEKO

    JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS   25 ( 13 )   3009 - 3014   1992年7月

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    記述言語:英語   出版者・発行元:IOP PUBLISHING LTD  

    Cross sections for single and multiple electron capture in collisions of C4+ with H-2, N2 and O2 have been measured within the energy range 0.33-666 eV amu-1. Where comparison is possible, the results are in good agreement with previous measurements at higher energies. Below 100 eV amu-1 there are significant differences between experiment and the currently available theories.

    DOI: 10.1088/0953-4075/25/13/009

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  • 28a-S-10 低エネルギー多価イオンの電荷移行反応VI C^<4+>-H_2、N_2、O_2衝突における電子捕獲断面積

    副島 浩一, Latimer C.J., 奥野 和彦, 小林 信夫, 金子 洋三郎

    年会講演予稿集   47 ( 4 )   40 - 40   1992年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本物理学会  

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  • Single-and double-electron capture in <sup>3</sup>He<sup>2+</sup>-H<sub>2</sub> collisions at low energy from 1 to 2000eV(共著)

    Journal of Physics B, Atomic, Molecular and Optical Physics   25 ( 4 )   L105 - L108   1992年

  • 30a-Q-2 低エネルギー多価イオンの電荷移行反応 : V.I^<q+>+He(q=24.25.26)衝突における電荷交換断面積

    副島 浩一, 奥野 和彦, 金子 洋三郎

    年会講演予稿集   46 ( 4 )   49 - 49   1991年9月

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    記述言語:日本語   出版者・発行元:一般社団法人日本物理学会  

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  • APPLICATION OF MINI-EBIS TO CROSS-SECTION MEASUREMENTS OF SINGLE AND DOUBLE ELECTRON-CAPTURE IN LOW-ENERGY COLLISIONS OF C-4+, N-4+ AND O-4+ WITH HE

    K OKUNO, K SOEJIMA, Y KANEKO

    NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS   53 ( 4 )   387 - 394   1991年4月

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    記述言語:英語   出版者・発行元:ELSEVIER SCIENCE BV  

    A small size electron beam ion source (mini-EBIS) cooled with liquid nitrogen has been developed for atomic collision research. An experimental technique using mini-EBIS in combination with an octupole ion beam guide (OPIG) has proved very useful for low energy collision experiments including highly charged ions. Single and double electron capture cross sections in collision systems of C4+ -He, N4+ -He and O4+ -He have been measured at low energies from 0.5 to 2000 eV in the center of mass system.

    DOI: 10.1016/0168-583X(91)95414-9

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  • 2a-N-6 低エネルギー多価イオンの電荷移行反応IV : ^3He^<2+>+He,H_2衝突における電子捕獲断面積

    副島 浩一, 奥野 和彦, 金子 祥三郎

    秋の分科会講演予稿集   1990 ( 4 )   27 - 27   1990年9月

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    記述言語:日本語   出版者・発行元:一般社団法人日本物理学会  

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  • 31a-R-2 低エネルギー多価イオンの電荷移行反応III. : O^<4+>-He衝突における1電子2電子捕獲断面積

    副島 浩一, 奥野 和彦, 金子 洋三郎

    年会講演予稿集   45 ( 4 )   51 - 51   1990年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本物理学会  

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  • 4a-ZG-9 低エネルギー多価イオンの電荷移行反応 : II.N^<4+>-He衝突における1電子2電子捕獲断面積

    副島 浩一, 奥野 和彦, 金子 洋三郎

    秋の分科会講演予稿集   1989 ( 4 )   42 - 42   1989年9月

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    記述言語:日本語   出版者・発行元:一般社団法人日本物理学会  

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  • 28a-R-11 低エネルギー多価イオンの電荷移行反応 : I.C^<4+>-He衝突における電荷移行反応断面積測定(原子・分子)

    副島 浩一, 奥野 和彦, 金子 洋三郎

    年会講演予稿集   44 ( 4 )   16 - 16   1989年3月

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    記述言語:日本語   出版者・発行元:一般社団法人日本物理学会  

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受賞

  • JSR Award for Young Scientist

    2000年  

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  • 日本放射光学会 若手奨励賞

    2000年  

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    受賞国:日本国

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共同研究・競争的資金等の研究

  • 希ガス原子の二重光電離過程における電子相関の研究

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    資金種別:競争的資金

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  • 多価イオンの電子捕獲過程に関する研究

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    資金種別:競争的資金

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  • Electron correlation study in double photoionization of rare gas atoms

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    資金種別:競争的資金

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  • Study on charge transter process of highly charged ions

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    資金種別:競争的資金

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