Abstract

The first informations about vibrational relaxation processes in liquids were obtained by observing the time evolution of the spontaneous anti-Stokes Raman scattering from vibrational states with a non equilibrium population1. Due to the small raman scattering cross sections and the envolved relaxation time constants these experiment are rather inefficient and require a picosecond time resolution. With the increasing performance of ultrashort laser systems and detection setups it is now possible to use the whole potential of this technique especially to monitor the time evolution of complete (anti-Stokes) Raman spectra with sufficient resolution2. This allows to observe all Raman active vibrational states which carry a transient excess population. Exciting one single vibrational mode via resonant IR absorption rather complex relaxation pathways can be identified and analysed.

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