Hannover 2013 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 8: Poster

MS 8.12: Poster

Mittwoch, 20. März 2013, 16:00–18:30, Empore Lichthof

Experimental setup of a time-of-flight mass spectrometer for reaction product detection in heterogeneous catalysis — •Andreas Winbauer, Martin Tschurl, Josef Kiermaier, Ulrich Boesl, and Ulrich Heiz — Chemistry Department, Technical University of Munich, Germany

Mass spectrometry is a very powerful analytical tool for the study of heterogeneous catalysis. It is often used to study reaction processes by analyzing the reaction products, both in a qualitative and in a quantitative way. Typically, mass spectrometers work by using electron impact ionization, where discrimination between isomers is difficult to achieve. Fragmentation patterns of the isomers must differ to a large extent to be distinguishable. A powerful and soft method for selective ionization is REMPI (Resonant Enhanced Multiphoton Ionization). In this technique a laser of specific wavelength is employed to ionize a single isomer through resonant intermediate states. Other isomers are not ionized as they are non resonant at the energy used. A new experimental setup was built for the study of catalytic reactions on metal clusters supported on single crystal surfaces under UHV conditions. Custom ion optics were designed to incorporate the crystal support and enable future desorption-ionization studies and enantioselective laser mass spectrometry. In this work we present our experimental setup, in which we combine time of flight mass spectrometry and resonance enhanced multiphoton ionization for investigation of products formed via surface reactions. It will thus be possible to examine the selectivity of catalytic reactions on size selected clusters.