Hannover 2013 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 24: Atomic clusters II (with A)

MO 24.5: Vortrag

Donnerstag, 21. März 2013, 15:15–15:30, F 428

Impact of electron-ion recombination on the ionization dynamics of Xenon clusters under XUV pump-probe excitation — •Mathias Arbeiter and Thomas Fennel — Institute of Physics, University of Rostock

A theoretical analysis of the ionization dynamics of Xenon clusters under XUV pump-probe excitation is presented for the parameter range studied in a recent experiment at ℏ ω = 92 eV [1]. In this scenario, the nanoplasma evolution in the pump-induced cluster expansion is probed by a delayed second pulse that further ionizes the target. The pump-probe experiments have shown that the average charge state of the fragment ions increases with delay [2]. This enhancement was interpreted as direct photoemission due to global cluster potential lowering within cluster expansion. The theoretical analysis verifies the presence of this effect. However, our simulations show that the contribution of the direct emission is too weak to explain the observations. Our simulations predict that the decrease of electron-ion recombination for longer delays is the dominant process. The theory results are in good agreement with the experiment for both absolute charge states and timescales.

[1] M. Arbeiter, Th. Fennel, to be submitted

[2] M. Krikunova, M. Adolph, T. Gorkhover, D. Rupp, S. Schorb, C. Bostedt, S. Roling, B. Siemer, R. Mitzner, H. Zacharias and T. Möller, J. Phys. B: At. Mol. Opt. Phys. 45, 105101 (2012)