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O: Fachverband Oberflächenphysik
O 121: Solid-Liquid Interface IV: Structure and Spectroscopy
O 121.1: Vortrag
Freitag, 20. März 2020, 10:30–10:45, TRE Phy
Implementation of a high-pressure cell in a UHV setup — •Jiri Pavelec, Florian Kraushofer, Francesca Mirabella, Jian Xu, Manuel Ulreich, Michael Schmid, Ulrike Diebold, and Gareth S. Parkinson — Institut of Applied Physics, Vienna University of Technology, Austria
The importance of bridging the pressure gap in studies of model catalysts has been recognized for decades. Here we will discuss a novel design for a high-pressure cell that allows us to study reactions occurring on UHV-prepared metal-oxide single-crystal samples at pressures up to 1 bar and temperatures up to 500 ∘C. In our setup, only the sample surface and the inner surface of a quartz tube are exposed to the gas at elevated temperature, which minimizes contamination. The maximum operational temperature is currently limited by quartz purity. Case studies of the Fe3O4(001) surface exposed to water vapour [1] and the oxidation of reduced rutile TiO2 will be presented.
[1] Kraushofer, Mirabella, Xu, Pavelec, Balajka, Müllner, Resch, Jakub, Hulva, Meier, Schmid, Diebold, and Parkinson; "Self-limited growth of an oxyhydroxide phase at the Fe3O4(001) surface in liquid and ambient pressure water." Chem. Phys. 151: 154702 (2019)