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A: Fachverband Atomphysik
A 29: Interaction with VUV and X-ray light I
A 29.8: Vortrag
Donnerstag, 26. März 2015, 13:00–13:15, C/HSW
Time-Dependent Multiphoton Ionization of Xenon in the Soft-X-Ray Regime — Nils Gerken1, Stephan Klumpp1, Andrey Sorokin2,3, Kai Tiedtke2, •Mathias Richter4, Vera Bürk1, Karolin Mertens1, Pavle Juranić2, and Michael Martins1 — 1Universität Hamburg, Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany — 2Deutsches Elektronen-Synchrotron, DESY, Notkestraße 85, 22603 Hamburg, Germany — 3Ioffe Physico-Technical Institute, Polytekhnicheskaya 26, 194021 St. Petersburg, Russia — 4Physikalisch-Technische Bundesanstalt, PTB, Abbestraße 2-12, 10587 Berlin, Germany
The time-dependent multiphoton ionization of xenon atoms was studied with femtosecond pulses in the excitation range of the 4d giant resonance at the photon energy of 93 eV [1]. Benefiting from a special operation mode of the free electron laser FLASH, the measurements were performed with varying pulse durations. A strong dependence of the ion charge distribution on the pulse duration allowed the different multiphoton mechanisms behind the multiple photoionization of xenon to be disentangled up to a charge state of 10+. The results up to 8+ are well explained by sequences of single photon, multiphoton, and Auger processes, but higher charge state generation suggests the need for collective electron multiphoton excitations.
[1] N. Gerken, S. Klumpp, A. A. Sorokin, K. Tiedtke, M. Richter, V. Bürk, K. Mertens, P. Juranić, M. Martins, Phys. Rev. Lett. 112, 213002 (2014)