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MO: Molekülphysik

MO 10: Femtosekundenspektroskopie: Schwingungsdynamik

MO 10.4: Talk

Monday, March 22, 2004, 17:15–17:30, HS 315

Femtosecond Vibrational Spectroscopy based on Stimulated Raman Scattering — •Stefan Laimgruber und Peter Gilch — Sektion Physik, Ludwig-Maximilians-Universität, Oettingenstr. 67, D-80538 München, Germany

The urge to follow structural dynamics of reacting molecules by femtosecond techniques has led to the extension of vibrational spectroscopy (IR and Raman) to that time regime. Raman techniques often suffer from extremely low scattering cross sections. This drawback can be diminished be reverting to stimulated Raman scattering. In a novel implementation [1] of this technique, a femtosecond white light pulse and a spectrally narrow laser pulse are overlapped in the sample. This allows for the acquisition of complete Raman spectra within very short times (≤ 1 s). If a third femtosecond laser pulse excites the sample, Raman spectra of transient species can be recorded. Here, a novel set-up for this Raman spectroscopy is introduced and first results on model compounds are presented. Particular emphasis is laid on the amplification of the solute signal by a resonance enhancement. [1] M. Yoshizawa, and M. Kurosawa, Phys. Rev. A 61 (2000) 013808