2013 Fiscal Year Final Research Report
Development of ab-initio simulation methods for molecules in an intense laser field
| Project/Area Number |
23656043
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Applied optics/Quantum optical engineering
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| Research Institution | The University of Tokyo |
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Principal Investigator |
ISHIKAWA Kenichi 東京大学, 工学(系)研究科(研究院), 教授 (70344025)
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| Co-Investigator(Kenkyū-buntansha) |
SATO Takeshi 東京大学, 工学系研究科, 特任助教 (30507091)
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| Project Period (FY) |
2011 – 2013
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| Keywords | アト秒科学 / 高強度場現象 |
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| Research Abstract |
We see remarkable progress in attosecond technology that uses ultrashort intense laser pulses to observe and manipulate electronic motion in atoms and molecules. Especially, multi-electron and electron correlation effects are attracting increasing interest.
We have studied single-photon ionization of an excited He atom by an attosecond XUV pulse, using the exact time-dependent Schrodinger equation simulations. We have discovered "knock-up" phenomena where the outgoing inner electron collides with the outer electron.
Further, we have developed a new ab-initio method to simulate multi-electron dynamics in an intense laser field. This method, called the time-dependent complete-active-space self-consistent-field (TD-CASSCF) method, introduces the concept of core and active orbital subspaces, allowing compact yet accurate representation of many-electron dynamics. This method will open a way to the first-principles theoretical study of realistic atoms and molecules in intense laser fields.
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[Journal Article] Photoelectron Angular Distributions for Two-photon Ionization of Helium by Ultrashort Extreme Ultraviolet Free Electron Laser Pulses2013
Author(s)
R. Ma, K. Motomura, K. L. Ishikawa, S. Mondal, H. Fukuzawa, A. Yamada, K. Ueda, K. Nagaya, S. Yase, Y. Mizoguchi, M. Yao, A. Rouzée, A. Hundermark, M. J. J. Vrakking, P. Johnsson, M. Nagasono, K. Tono, T. Togashi, Y. Senba, H. Ohashi, M. Yabashi, and T. Ishikawa
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Journal Title
J. Phys. B
Volume: 46
Pages: 164018
DOI
Peer Reviewed
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[Journal Article] Second-order autocorrelation of XUV FEL pulses via time resolved two-photon single ionization of He2011
Author(s)
R. Moshammer, Th. Pfeifer, A. Rudenko, Y. H. Jiang, L. Foucar, M. Kurka, K. U. Kühnel, C. D. Schröter, J. Ullrich, O. Herrwerth, M. F. Kling, X.-J. Liu, K. Motomura, H. Fukuzawa, A. Yamada, K. Ueda, K. L. Ishikawa, K. Nagaya, H. Iwayama, A. Sugihara, Y. Mizoguchi, S. Yase, M. Yao, N. Saito, A. Belkacem, M. Nagasono, A. Higashiya, M. Yabashi, T. Ishikawa, H. Ohashi, H. Kimura, and T. Togashi
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Journal Title
Opt. Express
Volume: 19(22)
Pages: 21698-21706
DOI
Peer Reviewed
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