Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 7: Heterogeneous Catalysis: Experiment
O 7.8: Vortrag
Montag, 12. März 2018, 12:15–12:30, MA 141
Decreasing the Pressure Gap: High-Pressure Low-Energy Electron Microscopy — •Benjamin Borkenhagen1, Thorsten Franz2, Bernhard von Boehn3, Ronald Imbihl3, Czeslaw Koziol2, Winfried Daum1, and Gerhard Lilienkamp1 — 1IEPT, TU Clausthal, Leibnizstraße 4, 38678 Clausthal-Zellerfeld — 2ELMITEC GmbH, Albrecht-von-Grodeck-Str. 3, 38678 Clausthal-Zellerfeld — 3PCI, Leibniz Universität Hannover, Callinstraße 3A, 30167 Hannover
Low-energy electron microscopy (LEEM) is a powerful tool for real-time studies on single crystal and polycrystalline surfaces, providing high surface sensitivity, chemical and structural contrast at lateral resolution as good as 2 nm. However, it is limited to vacuum environments with pressures below 10−5 mbar. High-pressure LEEM extends the accessible pressure range to 0.1 mbar and beyond, enabling microscopic in situ investigations of dynamic processes within a broad range of reaction conditions. We introduce high-pressure LEEM and present results from first high pressure experiments, including surface modification by oxidation and a catalytic surface reaction.