Sequential multiphoton multiple ionization of atomic argon and xenon irradiated by X-ray freeelectron laser pulses from SACLA. Abstract. We have investigated multiphoton multiple ionization of argon and xenon atoms at 5 keV using a new x-ray free electron laser (XFEL) facility, the SPring-8 Angstrom Compact free electron LAser (SACLA) in Japan. The experimental results are compared with new theoretical results presented here. The absolute fluence of the XFEL pulse has been determined with the help of the calculations utilizing twophoton processes in the argon atom. The high charge states up to +22 observed for Xe in comparison with the calculations point to the occurrence of sequential L-shell multiphoton absorption and of resonance-enabled x-ray multiple ionization. Journal of Physics

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