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Hamburg 2009 – scientific programme

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MO: Fachverband Molekülphysik

MO 13: Molekülphysik Poster 1

MO 13.11: Poster

Tuesday, March 3, 2009, 16:30–19:00, VMP 8 Foyer

Quantum dynamical simulations of femtosecond pump-DFWM spectroscopy of higher excited states — •Jörg Liebers, Abraham Scaria, Arnulf Materny, and Ulrich Kleinekathöfer — Jacobs University Bremen, Germany

Time- and frequency-resolved four-wave mixing (FWM) spectroscopy is a major tool to investigate dynamical properties of molecules. Until now the dynamics of the ground state and lower lying excited states of small molecules were well investigated in numerous experiments. By using a combination of an initial pump pulse and a degenerate four-wave mixing (DFWM) process, we show that the vibrational dynamics occurring in high-lying electronic states of molecules can be monitored as well. Experiments and simulations were performed on molecular bromine, where specific Franck-Condon overlaps between the B(3Πu+) and an ion pair state can be used to probe different parts of the excited state dynamics individually and therefore indirectly the contributions from different vibrational states in the electronic ground state.It is possible to selectively probe contributions of the hot vibrational states at room temperature. Here we present the results of quantum dynamical simulations which explain the details of this complex scenario. The experiments are detailed in a separate contribution.
[1] A. Scaria, V. Namboodiri, J. Konradi, A. Materny, Phys. Chem. Chem. Phys. 10 (2008) 983.

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