Charge and Nuclear Dynamics Induced by Deep Inner-Shell Multiphoton Ionization of CH3I Molecules by Intense X-ray Free-Electron Laser Pulses

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• 作者：Koji Motomura ; Edwin Kukk ; Hironobu Fukuzawa ; Shin-ichi Wada ; Kiyonobu Nagaya ; Satoshi Ohmura ; Subhendu Mondal ; Tetsuya Tachibana ; Yuta Ito ; Ryosuke Koga ; Tsukasa Sakai ; Kenji Matsunami ; Artem Rudenko ; Christophe Nicolas ; Xiao-Jing Liu ; Catalin Miron ; Yizhu Zhang ; Yuhai Jiang ; Jianhui Chen ; Mailam Anand ; Dong Eon Kim ; Kensuke Tono ; Makina Yabashi ; Makoto Yao ; Kiyoshi Ueda
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2015
• 出版时间：August 6, 2015
• 年：2015
• 卷：6
• 期：15
• 页码：2944-2949
• 全文大小：337K
• ISSN：1948-7185

文摘

In recent years, free-electron lasers operating in the true X-ray regime have opened up access to the femtosecond-scale dynamics induced by deep inner-shell ionization. We have investigated charge creation and transfer dynamics in the context of molecular Coulomb explosion of a single molecule, exposed to sequential deep inner-shell ionization within an ultrashort (10 fs) X-ray pulse. The target molecule was CH₃I, methane sensitized to X-rays by halogenization with a heavy element, iodine. Time-of-flight ion spectroscopy and coincident ion analysis was employed to investigate, via the properties of the atomic fragments, single-molecule charge states of up to +22. Experimental findings have been compared with a parametric model of simultaneous Coulomb explosion and charge transfer in the molecule. The study demonstrates that including realistic charge dynamics is imperative when molecular Coulomb explosion experiments using short-pulse facilities are performed.