Hannover 2010 – scientific programme

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A: Fachverband Atomphysik

A 8: Poster I

A 8.24: Poster

Tuesday, March 9, 2010, 16:30–19:00, Lichthof

Exploring attosecond experiments beyond single active electron — •Sebastian Bauch and Michael Bonitz — Christian-Albrechts-Universität Kiel, Institut für Theoretische Physik und Astrophysik, Leibnizstraße 15, 24098 Kiel, Germany

Experimental achievements in the last decade allow for the creation and control of high-harmonics generated attosecond light pulses [1]. Among the most exciting applications of this technique is the exploration of time-resolved electronic processes inside atoms, including the dynamics of electronic correlations. One milestone-experiment addresses the time-resolved exploration of shake-up state population via strong-field tunneling [2]. Owing to the weak intensity of the xuv pulse, a strong probing infrared pulse is used, leading to a significant perturbation of the electronic structure of the atom and the corresponding laser induced transitions. To describe these phenomena beyond the commonly used single-active electron approximation, we solve the time-dependent Schrödinger equation for a two-electron model atom. We present results for experiment-alike situations and compare our model to single-active electron calculations with a sudden approximation for the xuv pulse. Our approach allows for a systematic investigation of the influence of various xuv pulse parameters, e.g. pulse durations. The experimentally observed delay dependence of the double ionization is well reproduced in our simulations.

[1] F. Krausz and M. Ivanov, Rev. Mod. Phys. 81, 163 (2009); [2] M. Uiberacker et al., Nature (London) 446, 627 (2007)