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P: Fachverband Plasmaphysik

P 18: Poster: Theorie/Simulation dichter und stark gekoppelter Plasmen

P 18.23: Poster

Mittwoch, 30. März 2011, 16:30–18:30, Foyer

Electronic correlations in double ionization of atoms in pump-probe experiments — •Sebastian Bauch, Karsten Balzer, and Michael Bonitz — Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität zu Kiel, D-24098 Kiel

The (correlated) dynamics of few-body systems in strong laser fields is in focus of active research since the last two decades. One example is the famous non-sequential double ionization of Helium. With nowadays experimentally available tools it is possible to investigate these processes on the sub-femtosecond timescale. Typically, a short extreme ultraviolet (XUV) pump pulse is combined with a longer infrared (IR) probe pulse. We present theoretical results based on the time-dependent Schrödinger equation for such a pump-probe experiment involving two active electrons[1]. A dramatic change of the double-ionization yield with variation of the pump-probe delay is reported. We identify the governing role of electron-electron correlations, through a complex interplay of (1) inner-atomic electron shake up and (2) rescattering with subsequent impact ionization. Our results allow for a direct control of the double ionization yield, and the relative strength of double and single ionization.

[1] S. Bauch, K. Balzer and M. Bonitz, Europhys. Lett. 91 53001 (2010)