Berlin 2005 – wissenschaftliches Programm

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MO: Molekülphysik

MO 23: Femtosecond Spectroscopy

MO 23.2: Vortrag

Samstag, 5. März 2005, 14:15–14:30, HU 2091

Femtosecond pump-repump-probe spectroscopy of the solvated electron in methanol: The role of H-bonds — •Andy Thaller, Robert Laenen, and Alfred Laubereau — Technische Universitaet Muenchen, Physik-Department E11, James-Franck-Strasse, D-85748 Garching

We present a detailed investigation of the solvated electron in methanol. The electrons are generated via two photon absorption of the third harmonic (4.5 eV, 100 fs) of a regenerative amplified Ti:Sapphire laser. Part of the original pulse at 820 nm is used to selectively re-excite the electrons at a certain time after generation (preparation time). The induced ΔOD of the sample due to generation or re-excitation is obtained polarization-resolved using probe pulses ranging from 450 nm to 2.4 µm.

In a global analysis a kinetic model is fitted to our data. This yields temporal and spectral information used to interpret the nature of the involved transient species. With this approach we reach a detailed microscopic model that emphasizes the important role H-bonds in the solvation shell play in electron solvation dynamics.