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.