Multiphoton and above-threshold ionization in the XUV energy range
ORAL
Abstract
Recent experiments at the free-electron laser in Hamburg FLASH have succeeded in measuring direct multiphoton ionization and above-threshold ionization (ATI) in the XUV. We present a theoretical description of the phenomena seen in argon and xenon in an ab initio approach using the time-dependent configuration interaction singles method. Upon solving the time-dependent Schr\"odinger equation for the N-electron problem the photoelectron spectrum is calculated. Multiphoton absorption cross sections are derived and employed to quantify the ATI process for different photon energies.
*This work has been supported by the Deutsche Forschungsgemeinschaft under Grant No. SFB 925/A5.
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