Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 30: Interaction with VUV and X-ray light I

A 30.7: Vortrag

Mittwoch, 19. März 2014, 15:45–16:00, BEBEL E42

Multiphoton ionization of Argon in the XUV: Theoretical study of ATI processes seen at FLASH — •Antonia Karamatskou^1,2, Stefan Pabst¹, and Robin Santra^1,2 — ¹Center for Free-Electron Laser Science, DESY, Hamburg, Germany — ²Department of Physics, Universität Hamburg, Hamburg, Germany

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. Upon solving the time-dependent Schrödinger equation the photoelectron spectrum is calculated. Multiphoton absorption cross sections are derived and employed to quantify the ATI process for different photon energies.