Darmstadt 2008 – scientific programme

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MO: Fachverband Molekülphysik

MO 18: Femtosekundenspektroskopie

MO 18.5: Poster

Tuesday, March 11, 2008, 14:00–19:00, Poster C1

Anisotropy in ultrafast experiments — •Andreas-Neil Unterreiner and Oliver Schalk — Universität Karlsruhe (TH), Lehrstuhl für Molekulare Physikalische Chemie, 76128 Karlsruhe

A new ansatz for anisotropy in ultrafast experiments is presented. It is capable of describing systems with non-degenerate, degenerate and quasi-degenerate excited states (the latter concerning systems which are excited near a conical intersection) for one- or multiphoton pump-probe experiments. This contribution focuses on degeneracy and quasi-degeneracy. The degenerate case exhibits a high time zero anisotropy that decays due to coherence and population decay. This decay can be described with an Ornstein-Uhlenbeck process. Discrepancies to former models are discussed. In this model, quasi-degeneration in anisotropy experiments can be explained as a mixture of non-degenerate and twofold degenerate excited states and represents the first quantitative description of such processes.