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O: Oberflächenphysik

O 30: Hauptvortrag Denecke

O 30.1: Hauptvortrag

Donnerstag, 11. März 2004, 10:15–11:00, H36

Surface chemistry studied by in-situ x-ray photoelectron spectroscopy — •Reinhard Denecke — Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen

Important aspects of surface science are the dynamics of adsorption and reaction processes. Using high-resolution x-ray photoelectron spectroscopy together with high flux synchrotron radiation and in combination with a molecular beam, such time-dependent processes can be followed on a time scale of seconds. Spectroscopic information about the species involved can be obtained from the binding energy shifts of adsorbate and substrate core levels. In the case of hydrocarbons, the vibrational fine structure can additionally be used to identify surface species. From quantitative information obtained by intensity analysis, kinetic parameters can be derived. Examples are discussed for bimolecular reactions (CO oxidation), activated adsorption (dissociative adsorption of methane and ethane) and thermal dehydrogenation of hydrocarbons.

Supported by the DFG (Ste 620/4-2).