Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.67: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster B
Photocatalysis with supported size-selected metal clusters — •Martin Tschurl1, Josef Kiermaier1, Andreas Winbauer1, Friedrich Esch1, Claude Henry2, and Ulrich Heiz1 — 1TU München, Catalysis Research Center, Lichtenbergstr. 4, 85748 Garching, Germany — 2CINaM-CNRS, Campus de Luminy, Case 913, 13288 Marseille Cedex 09, France
In this work we present a setup for the study of the photochemical properties of size-selected clusters softlanded on various support materials. The apparatus consists of a laser ablation cluster source with ion optics for guiding the cluster beam and a quadrupole for mass selection. The size-selected clusters are softlanded on a special temperature-adjustable sample holder and can then be further characterized.
To determine the photocatalytic activity of the clusters, reaction products will be monitored. For this purpose our setup is equipped with a standard quadrupole mass selector with electron ionization. In addition, we have developed a new type of time-of-flight mass spectrometer, which is used in combination with REMPI (Resonant Enhanced Multiphoton Ionization). This spectrometer is specially designed to study the formation of different isomers. In this case, discrimination can be achieved by selecting a wavelength, which is in resonance with the electronic states of just one of the reaction products. This resonant process will greatly enhance the ionization yield of this particular species, which can then be detected in the time-of-flight spectrometer with very high sensitivity.