Dresden 2011 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 9: Interaction with VUV and X-ray light (FEL) II
A 9.4: Vortrag
Dienstag, 15. März 2011, 12:00–12:15, BAR 205
XUV-multiphoton ionization at atomic giant resonances at different timescales — •Nils Gerken, Stephan Klumpp, Vera Linsenmann, Ricarda Laasch, Karolin Mertens, Wilfried Wurth und Michael Martins — Institut für Experimentalphysik, Luruper Chaussee 149, 22761 Hamburg, Germany
We present multi-ionization processes of Xenon in the region of the Xe giant resonance measured with ion mass-to-charge spectroscopy at ultrahigh intensities. At the free-electron laser facility FLASH Peak intensities of 1012 - 1013 W/cm2 were reached whereas the pulse lengths of a few hundred femtoseconds were longer than in previous Xen+ multiphoton excitations [1,2]. In our experiment we observe strong differences of the relative ion distribution compared to earlier experiments. We concentrate on the mid pulse energy regime, where sequential processes dominate the multiphoton ionization and the resonant structure of the different ions are of importance. Especially Xe6+ and Xe7+ ion signal intensities are much stronger at pulse lengths in the order of a few hundred femtoseconds compared to previous experiments with one order of magnitude shorter pulse lengths. Furthermore we extended the experiment to other atoms with similar giant resonant excitation behaviour.
[1] A. A. Sorokin et al., Phys. Rev. Lett. 99, 213002 (2007)
[2] M. Richter et al., Phys. Rev. Lett. 102, 163002 (2009)