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

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 AnandDong Eon Kim, Kensuke Tono, Makina Yabashi, Makoto Yao, Kiyoshi Ueda

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)2944-2949
Number of pages6
JournalJournal of Physical Chemistry Letters
Issue number15
Publication statusPublished - 2015 Aug 6


  • Coulomb explosion
  • X-ray free-electron laser
  • charge transfer
  • multiphoton multiple ionization
  • ultrafast dynamics

ASJC Scopus subject areas

  • Materials Science(all)
  • Physical and Theoretical Chemistry

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