Darmstadt 2008 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 10: Posters: Atomic clusters

A 10.4: Poster

Dienstag, 11. März 2008, 16:30–18:30, Poster C3

Multistep ionization of Argon clusters in intense femtosecond XUV laser pulses — •Mathias Arbeiter and Thomas Fennel — Institute of Physics, University of Rostock

The ionization dynamics of Argon clusters in ultrashort and intense XUV laser pulses is investigated by molecular dynamics simulation. Corresponding experiments^[1] at FLASH free electron laser at λ=32 nm and intensities of I∼ 10¹²⁻¹⁴W/cm² have demonstrated the cluster response to be completely different to the behavior observed in the infrared and the VUV regime, where plasma heating processes dominate the laser-cluster coupling. In the XUV regime, in contrast to that, the measured photoemission spectra indicate a series of direct electron emission events in the developing cluster Coulomb field, which eventually induces frustration of the photoemission at a certain level of ionization. In our MD analysis we focus on the impact of multi-electron effects, thermalization, and ionic motion within the interaction process and corresponding signature in the electron and ion emission spectra.

[1] C. Bostedt et al., submitted