Düsseldorf 2007 – scientific programme

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MO: Fachverband Molekülphysik

MO 13: Photochemistry

MO 13.9: Talk

Monday, March 19, 2007, 18:30–18:45, 6B

Photochemistry inside superfluid helium nano droplets — •Alkwin Slenczka, Alexander Vdovin, and Bernhard Dick — Institut für Physikalische und Theoretische Chemie, Universität Regensburg, 93053 Regensburg, Germany

Superfluid helium nano droplets serve as the most gentle cryogenic matrix for creating isolated and cold molecules [1]. High resolution electronic spectroscopy is sensitive for the investigation of the very weak perturbation of the helium droplet on the embedded molecule. Fluorescence excitation spectra, dispersed emission spectra and pump-probe-spectra show details of the salvation of molecules in helium droplets which were attributed to relaxation processes of the first solvation layer around the dopant [2]. Photochemistry such as ESIPT, tautomerization by proton transfer and charge transfer are highly sensitve on intermolecular perturbations. We have studied such processes in superfluid helium droplets. The comparison with the respective gas phase experiments and quantum chemical calculations reveals further details on the photochemistry as well as on the perturbation by the superfluid helium droplet.

[1] F. Stienkemeier, K. K. Lehmann, J. Phys. B: Mol. Opt. Phys. 39(2006) R127-R166.

[2] R. Lehnig, and A. Slenczka, J. Chem. Phys. 123, (2005).; Chem. Phys. Chem. 5, (2004) 1013-1019; J. Chem. Phys. 120, (2004), 5064-5066; J. Chem. Phys. 118, (2003) 8256-8260.