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O: Oberflächenphysik
O 26: Oxide und Isolatoren I
O 26.6: Vortrag
Samstag, 5. März 2005, 16:15–16:30, TU EB202
A Combined In-situ SXRD and HRCLS study of the Oxidation of Ag(111) — •Alexander Reicho1, Andreas Stierle1, Ioan Costina1, Helmut Dosch1, Edvin Lundgren2, Johan Gustafson2, and Jesper Andersen2 — 1Max-Planck-Institute for Metals Research, Heisenbergstr. 3, 70569 Stuttgart, Germany — 2Department of Synchrotron Radiation Research, Lund University, Box 118, S-22100, Sweden
Silver is used as catalyst for the epoxidation of ethylene and during the partial oxidation of methanol to formaldehyde. The formation of an oxygen induced p(4x4) reconstruction of the Ag(111) surface was reported, which was made responsible for the catalytic activity of Ag. We will present an in-situ surface x-ray diffraction study on the interaction of oxygen with the Ag(111) surface from UHV up to 2 bar, which will shed new light on the previously proposed structural model of the p(4x4) reconstruction and the stability diagram of the Ag(111)/O-system, which can be compared with theoretical studies. In addition High Resolution Core Level Spectroscopy was applied to get information about the binding geometry of the oxygen atoms. In the presentation several structural models of the p(4x4) reconstruction will be discussed.