Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures
O 37.88: Poster
Tuesday, April 1, 2014, 18:30–22:00, P2
Water dissociation on α-Al2O3(1102) — •Sebastian Wlosczyk1, Harald Kirsch1, Jonas Wirth2, Martin Wolf1, Peter Saalfrank2, and R. Kramer Campen1 — 1Fritz-Haber-Institut, Abt. Physikalische Chemie, 14195 Berlin, Germany — 2Universitaet Potsdam, Institut fuer Chemie, 14476 Potsdam OT Golm, Germany
Alumina surfaces are ubiquitous in technologically relevant applications and a useful model system for more complicated, environmentally abundant, alumino-silicate phases. Because their properties change dramatically on interaction and reaction with water, water/Alumina chemistry has been studied, both experimentally and theoretically, for decades. In this work, we study the interaction of heavy water (D2O) with the α-Al2O3(1102) surface under ultra high vacuum (UHV) conditions. In-situ preparation of the carbon-free, well defined single crystal surfaces is checked by low energy electron diffraction (LEED) and Auger electron spectroscopy (AES). Hydroxylation of the Al2O3(1102) in UHV is performed by dosing D2O seeded in Helium with a molecular beam source (MBS). For characterization we employ vibrationally resonant sum frequency generation (VSF) spectroscopy to probe the OD stretch response of interfacial species and thermal desorption spectroscopy (TDS). The aim of the study is to investigate the adsorbate/substrate interaction and understand the effect of surface morphology on the hydroxylation process.