Stuttgart 2012 – scientific programme

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MO: Fachverband Molekülphysik

MO 13: Poster 1: Cold Molecules, Femtosecond Spectroscopy, Molecular Dynamics

MO 13.16: Poster

Tuesday, March 13, 2012, 16:30–19:00, Poster.IV

Fragment momentum distributions obtained from coupled electron-nuclear dynamics — •Kilian Hader and Volker Engel — Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Emil-Fischer-Str. 42, 97074 Würzburg

We theoretically investigate fragmentation processes induced by femtosecond laser pulses within a model which incorporates electronic and nuclear motion. Single-pulse excitation leads to diffraction patterns in the electron-momentum distribution which depend on the nature of the electronic state and also on the nuclear charge distribution. Additional structures appear in the nuclear-momentum distribution if two time-delayed pulses produce fragments in the same dissociation channel. It is shown that these functions are modified by the electronic degree-of-freedom. A simultaneous excitation of two different electronic state results in further interferences which are related to electronic wave-packet dynamics on the attosecond time-scale.