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Berlin 2012 – scientific programme

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O: Fachverband Oberflächenphysik

O 14: Adsorption on semiconductors, oxides and insulators II

O 14.6: Talk

Monday, March 26, 2012, 17:15–17:30, MA 041

LEED I(V) analysis of oxygen physisorption on the rumpled NaCl(100) surfaceAnne Möller, Stephan Härtel, •Jochen Vogt, and Helmut Weiss — Chemisches Institut der Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany

Among the diatomic molecules, O2 is unique due to its magnetic properties in the gas phase and in the bulk[1]. The structure of O2 adsorbed on the NaCl(100) surface is of interest in many respects, e. g. for studies of the surface aligned photochemistry of O2. We have characterized the physisorption of O2 using low-energy electron diffraction (LEED) with primary electron currents in the nA range and electron energies above 70 eV. No signs of electron beam induced charging of the NaCl surface were perceptible even at cryogenic temperatures. A saturated 2D phase O2-p(1×1)/NaCl(100) was prepared at temperatures below 31 K. LEED diffraction spot intensities were recorded as a function of electron energy. The subsequent determination of the adsorbate structure based on a full-dynamical LEED-I(V) analysis reveals that O2 is bound on top of the Na+ cations. The rumpling of the NaCl(100) surface [2] appears to be unaffected by the adsorbed O2, consistent with its very weak interaction with the substrate. The details of the adsorbate structure will be discussed and compared with the results of model calculations.

Y. A. Freiman, H. J. Jodl, Phys. Rep. 401 (2004), 1
J. Vogt, H. Weiss, Surf. Sci. 491 (2001), 155

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