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MO: Fachverband Molekülphysik

MO 58: Poster: Molecular Dynamics (Theory)

MO 58.2: Poster

Thursday, March 22, 2007, 16:30–18:30, Poster A

Decoherence of vibrational wave packets — •Martin Schlesinger and Walter Strunz — Theoretische Quantendynamik, Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg

We clarify the effect of rovibrational coupling on the coherence of molecular vibrations [1]. Depending on the temperature chosen we observe a significant suppression of (fractional) revivals in the pump-probe signal [2]. As a measure of coherence we calculate the purity of the vibronic density operator and find a remarkable oscillatory behaviour on the vibrational time scale. Finally we extend our investigations to dimers attached to He nanodroplets [3].

[1] T. Baumert, V. Engel et. al., Chem. Phys. Lett. 191, 6 (1992)

[2] C. Brif, H. Rabitz et. al., Phys. Rev. A 63, 063404 (2001)

[3] P. Claas, G. Droppelmann et. al., J. Phys. B (submitted)