Berlin 2008 – scientific programme

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O: Fachverband Oberflächenphysik

O 52: Time-Resolved Spectroscopy III

O 52.4: Talk

Wednesday, February 27, 2008, 16:00–16:15, MA 042

Observing photo-induced chemical reactions of molecules on surfaces in real-time — •Mihai E. Vaida, Peter E. Hindelang, Robert Tchitnga, and Thorsten M. Bernhardt — Institut für Oberflächenchemie und Katalyse, Universität Ulm, Albert-Einstein-Allee 47, D-89069 Ulm, Germany

Time-of-flight mass spectrometry in conjunction with femtosecond resonance-enhanced multiphoton ionization is used to monitor ultra-fast chemical reactions of supported molecules. A new experimental approach enables the quick and precise in situ preparation of the surface with sub-monolayer adsorbate coverage prior to photo-induced reaction. The investigation of different reaction pathways is accomplished by direct real-time monitoring of the different reaction products and intermediates as well as their kinetic energy content. First results for methyl iodide adsorbed on ultra-thin insulating magnesia films will be presented.