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MO: Fachverband Molekülphysik

MO 22: Femtosecond Spectroscopy IV

MO 22.2: Talk

Thursday, March 17, 2011, 14:45–15:00, TOE 317

A phenomenological model for dissipation in dimers attached to helium nanodroplets — •Martin Schlesinger¹, Walter T. Strunz¹, Barbara Grüner², Marcel Mudrich², and Frank Stienkemeier² — ¹Institut für Theoretische Physik, TU Dresden, 01062 Dresden — ²Physikalisches Institut, Universität Freiburg, 79104 Freiburg

Femtosecond pump-probe spectroscopy has been used to study vibrational wave packet dynamics in dimers attached to helium nanodroplets [1]. For the simulation of the dynamics, we use a well-known master equation to describe damping of vibrational wave packets [2]. This approach allows to reproduce the loss of signal contrast on the measurement timescale and to relate it to decoherence of vibrational wave packets. We find that decoherence occurs faster than dissipation. An analytical solution of the master equation allows to explain an oscillatory decay of coherences of the vibrational density matrix. Moreover, the decoherence rate can be quantified.

[1] M. Mudrich et. al., Phys. Rev. A 80 , 042512 (2009)

[2] B. Grüner et. al., arXiv:1011.0924v1