München 2004 – wissenschaftliches Programm
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MO: Molekülphysik
MO 12: Poster I
MO 12.23: Poster
Dienstag, 23. März 2004, 14:00–16:00, Schellingstr. 3
Ionization of H2 in intense laser pulses — •Erich Goll1, Alejandro Saenz2, and Günter Wunner3 — 1Inst. f. Theor. Chem., Universität Stuttgart, D-70569 Stuttgart — 2Inst f. Phys., Humboldt-Universität zu Berlin, D-10117 Berlin — 3Inst. f. Theor. Phys. 1, Universität Stuttgart, D-70569 Stuttgart
The ionization of H2 in intense laser pulses was investigated by solving the time-dependent Schrödinger equation in the basis of eigenfunctions of the H2 potential. In order to describe the ionization we employed an ionization operator, which depends on the ionization potential. This potential corresponds to the difference between the potential curves of H2 and H2+ and therefore varies with the distance of the nuclei. In short pulses this leads to an effect called Lochfraß (hole biting). It means that the wave function decreases fast in particular at those nuclear distances, where the ionization rate is high.
Quantitative analysis shows that this effect only partly accounts for the suppressed ionization of H2, where the ion yield for H2 is much lower than for Ar, despite the similarity of their ionization potentials.
We have performed calculations not only for the ionization step but also for the ensuing time evolution of the wave function in the H2+ potential. We find that the occupation of the vibrational states does not obey the Franck-Condon principle.