Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 60: Poster Session IV (Solid/liquid interfaces; Semiconductors; Oxides and insulators; Graphene; Plasmonics and nanooptics; Electronic Structure; Surface chemical reactions; Heterogeneous catalysis)

O 60.114: Poster

Mittwoch, 16. März 2011, 17:30–21:00, P4

Experimental setup of a time-of-flight mass spectrometer for reaction product detection in heterogeneous catalysis — •Andreas Winbauer, Martin Tschurl, Josef Kiermaier, and Ulrich Kaspar Heiz — Lichtenbergstraße 4, 85748 Garching

Mass spectrometry is a very powerful analytical tool for the study of heterogeneous catalysis. It's often used to study reaction processes by analyzing the reaction products, both in a qualitative and in a quantitative way.

Often mass spectrometers work by using electron impact ionization, where a discrimination between isomers is difficult to achieve. Their fragmentation patterns must differ to a large extent.

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 only one isomer through resonant intermediate states. Other isomers cannot be ionized as they are non resonant at the energy used.

For the study of catalytic reactions on metal clusters supported on single crystal surfaces under UHV conditions a new experimental setup was built. For the spectroscopic studies custom ion optics were designed to incorporate the crystal support and enable future desorption-ionization studies.

In this work we will present our experimental setup, in which we combine time of flight mass spectrometry with resonance enhanced multiphoton ionization. Furthermore we will show first experimental results and possible applications for our setup.