Berlin 2014 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 6: Poster

MS 6.16: Poster

Mittwoch, 19. März 2014, 14:00–14:00, DO24 Foyer

A time-of-flight mass spectrometer with laser ionization for sensitive product molecule detection for heterogeneous model reactions — •Martin Tschurl, Andreas Winbauer, Sebastian Kollmannsberger, Josef Kiermaier, Ulrich Boesl, and Ueli Heiz — Lehrstuhl für Physikalische Chemie & Catalysis Research Center, Chemistry Department, Technische Universität München, Lichtenbergstraße 4, 85748 Garching bei München, Germany

Investigations of model catalysts are very often performed in ultra-high vacuum for ensuring very well-defined systems. Usually, product molecule detection is performed by electron impact (EI) ionization in a quadrupole mass spectrometer. While this method offers the possibilities of continuous measurements and high sensitivity, it features the drawback that a mass scan has to be performed to detect the masses of all reaction products. In addition, the discrimination between isobars is difficult to achieve because of the unselective properties of EI ionization. In this work we present a time-of-flight MS in combination with laser ionization. Due to the setup, this system allows for a very sensitive detection of isobaric species. In this poster the detection principle is illustrated and first proof-of-principle measurements are shown.