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MO: Fachverband Molekülphysik

MO 7: Poster: Femtosecond Spectroscopy

MO 7.4: Poster

Dienstag, 9. März 2010, 16:00–18:30, Lichthof

Two-Photon Processes in Femtosecond Time-Resolved Four-Wave Mixing Spectroscopy: β-Carotene — •Vinu V Namboodiri, Mahesh Namboodiri, Günter Flachenecker, and Arnulf Materny — Jacobs University Bremen, Bremen, Germany

Pump-degenerate four-wave mixing (pump-DFWM) using femtosecond pulses is used to study the dynamics of excited population (S1) and ground state vibrational relaxation of β-carotene molecules in different solvents. An initial pump (IP) pulse populates the S2 state. The DFWM pulses are tuned to be in resonance with the SnS1 transition. Scanning the time delay between the IP and the DFWM sequence gives rise to a transient, which could not be explained up to now [1]. Recent experiments have shown that two-photon transitions have to be taken into account. A three-level kinetic model including a two-photon process is used to fit the transients and extract time constants. The time constants obtained are in agrement with previously reported values [2,3].
References:
V. Namboodiri, A. Scaria, M. Namboodiri, A. Materny, Las. Phys. 19, 154 (2009).
J. Hauer, T. Buckup, M. Motzkus, J. Phys. Chem. A 111, 10517 (2007).
D. W. McCamant, J.E. Kim, R.A. Mathies, J. Pys. Chem. A 106, 6030 (2002).

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