Darmstadt 2008 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 31: Interaction with intense laser pulses III: VUV and X-ray light

A 31.1: Vortrag

Freitag, 14. März 2008, 14:00–14:15, 3D

Ion Recombination and Delayed Expansion Dynamics of Rare Gas Clusters exposed to Intense XUV Laser Pulses — •Matthias Hoener¹, Heiko Thomas¹, Christoph Bostedt¹, Ekaterina Eremina¹, Lasse Landt¹, Hubertus Wabnitz², Rolf Treusch², Rubens de Castro³, and Thomas Möller¹ — ¹IOAP, TU Berlin, Germany — ²Hasylab at DESY, Hamburg, Germany — ³LNLS, Campinas, Brazil

We have studied the ionisation processes of core – shell cluster systems exposed to intense XUV laser pulses up to 10¹⁴ W/cm² from the FLASH free electron laser. A strong size dependence of ionisation processes is observed for XeAr clusters. Charged fragments from the Xe core are almost absent in the mass spectra of large XeAr clusters (<N>=4000). At the same time Ar ions up to 4+ are present. We propose that only the Ar surface layers disintegrate by coulomb explosion while atoms in the cluster core recombine and the expansion is delayed. The delayed expansion may have significant implications for future imaging experiments in the XUV and x-ray regime, since it can relax the restriction of x-ray pulse length given by the time when radiation damage sets in. The findings are compared to recent theoretical predictions.