Frankfurt 2006 – scientific programme
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MO: Molekülphysik
MO 44: Quantum Chemistry and Molecular Dynamics
MO 44.6: Talk
Wednesday, March 15, 2006, 17:45–18:00, H12
Non-perturbative treatment of ionisation of molecular hydrogen in intense ultra-short laser pulses — •Alejandro Saenz and Manohar Awasthi — AG Moderne Optik, Institut für Physik, Humboldt-Universität zu Berlin, Hausvogteiplatz 5-7, 10117 Berlin
Results are presented that were obtained with a recently developed numerical approach to the solution of the time-dependent Schrödinger equation (TDSE) describing the fully correlated, three-dimensional motion of the electrons of H2 in intense ultra-short laser pulses. First, a comparison of the results with the predictions from simplified models (perturbation theory, Ammosov-Delone-Krainov tunneling model, and strong-field approximation SFA) is given. The second part discusses the influence of vibrational motion on the total ionisation yield, but especially on the vibrational distribution of the formed H2+ ions. The recent experimental results that showed a strong non-Franck-Condon distribution (in conflict with previous assumptions) were originally explained by one of us on the basis of the quasi-static approximation [1]. Since the latter is not necessarily valid an investigation using the solution of the TDSE was now performed. This is especially important in view of an alternative physical explanation based on the SFA that was very recently given for the experimentally found vibrational distribution [2].
[1] X. Urbain et al., Phys. Rev. Lett. 92, 163004 (2004).
[2] T. K. Kjeldsen and L. B. Madsen, Phys. Rev. Lett. 95, 073004 (2005).