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arXiv · 1210.0673

Deep inner-shell multiphoton ionization by intense x-ray free-electron laser pulses

H. Fukuzawa·S. -K. Son·K. Motomura·S. Mondal·K. Nagaya·S. Wada·X. -J. Liu·R. Feifel·T. Tachibana·Y. Ito·M. Kimura·T. Sakai·K. Matsunami·H. Hayashita·J. Kajikawa·P. Johnsson·M. Siano·E. Kukk·B. Rudek·B. Erk·L. Foucar·E. Robert·C. Miron·K. Tono·Y. Inubushi·T. Hatsui·M. Yabashi·M. Yao·R. Santra·K. Ueda
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Abstract

We have investigated multiphoton multiple ionization dynamics of argon and xenon atoms using a new x-ray free electron laser (XFEL) facility, SPring-8 Angstrom Compact free electron LAser (SACLA) in Japan, and identified that highly charged Xe ions with the charge state up to +26 are produced predominantly via four-photon absorption as well as highly charged Ar ions with the charge state up to +10 are produced via two-photon absorption at a photon energy of 5.5 keV. The absolute fluence of the XFEL pulse, needed for comparison between theory and experiment, has been determined using two-photon processes in the argon atom with the help of benchmark ab initio calculations. Our experimental results, in combination with a newly developed theoretical model for heavy atoms, demonstrate the occurrence of multiphoton absorption involving deep inner shells.

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H. Fukuzawa, S. -K. Son, K. Motomura, S. Mondal, K. Nagaya, S. Wada, X. -J. Liu, R. Feifel, T. Tachibana, Y. Ito, M. Kimura, T. Sakai, K. Matsunami, H. Hayashita, J. Kajikawa, P. Johnsson, M. Siano, E. Kukk, B. Rudek, B. Erk, L. Foucar, E. Robert, C. Miron, K. Tono, Y. Inubushi, T. Hatsui, M. Yabashi, M. Yao, R. Santra, K. Ueda. 2012-10-02. Deep inner-shell multiphoton ionization by intense x-ray free-electron laser pulses. https://doi.org/10.1103/physrevlett.110.173005

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