@article{Fukuzawa13, author={H. Fukuzawa and Sang-Kil Son and K. Motomura and S. Mondal and K. Nagaya and S. Wada and X.-J. Liu and R. Feifel and T. Tachibana and Y. Ito and M. Kimura and T. Sakai and K. Matsunami and H. Hayashita and J. Kajikawa and P. Johnsson and M. Siano and E. Kukk and B. Rudek and B. Erk and L. Foucar and E. Robert and C. Miron and K. Tono and Y. Inubushi and T. Hatsui and M. Yabashi and M. Yao and R. Santra and K. Ueda}, title={Deep inner-shell multiphoton ionization by intense x-ray free-electron laser pulses}, journal={Phys. Rev. Lett.}, volume={110}, pages={173005}, year={2013}, keywords={Xe; Ar; ionization dynamics; multiphoton; multiple ionization; inner-shell; decay cascade; x-ray; SACLA; experiment; XATOM; XFEL; CFEL; DESY;}, url={https://doi.org/10.1103/PhysRevLett.110.173005}, doi={10.1103/PhysRevLett.110.173005}, abstract={We have investigated multiphoton multiple ionization dynamics of xenon atoms using a new x-ray free-electron laser facility, SPring-8 Angstrom Compact free electron LAser (SACLA) in Japan, and identified that Xe$^{n+}$ with n up to 26 is produced at a photon energy of 5.5 keV. The observed high charge states (n$\geq$24) are produced via five-photon absorption, evidencing the occurrence of multiphoton absorption involving deep inner shells. A newly developed theoretical model, which shows good agreement with the experiment, elucidates the complex pathways of sequential electronic decay cascades accessible in heavy atoms. The present study of heavy-atom ionization dynamics in high-intensity hard-x-ray pulses makes a step forward towards molecular structure determination with x-ray free-electron lasers.}
}
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doi:10.1103/PhysRevLett.110.173005