Regensburg 2010 – scientific programme

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O: Fachverband Oberflächenphysik

O 41: Poster Session I (Semiconductor Substrates: Epitaxy and growth; Semiconductor Substrates: Adsorbtion; Semiconductor Substrates: Solid-liquid interfaces; Semiconductor Substrates: Clean surfaces; Oxides and insulators: Epitaxy and growth; Oxides and insulators: Adsorption; Oxides and insulators: Clean surfaces; Organic, polymeric and biomolecular films - also with adsorbates; Organic electronics and photovoltaics, Surface chemical reactions; Heterogeneous catalysis; Phase transitions; Particles and clusters; Surface dynamics; Surface or interface magnetism; Electron and spin dynamics; Spin-Orbit Interaction at Surfaces; Electronic structure; Nanotribology; Solid/liquid interfaces; Graphene; Others)

O 41.48: Poster

Tuesday, March 23, 2010, 18:30–21:00, Poster B1

Adsorption and reactions of unsaturated hydrocarbon molecules on stepped Pt surfaces — Erik Darlatt¹, Sandra Wickert¹, Michael P. A. Lorenz², Regine Streber², Christian Papp², Hans-Peter Steinrück², and •Reinhard Denecke¹ — ¹Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnestr. 2, 04103 Leipzig, Germany — ²Lehrstuhl für Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen, Germany

Using in-situ high-resolution XPS at the synchrotron radiation source BESSY II, bonding configurations of ethylene and propylene have been investigated on stepped Pt surfaces. Ethylene adsorbs on Pt(355) with significant spectral changes in C 1s compared to Pt(111), resulting from a specific step related feature. The saturation coverage related to this more strongly bound species amounts to about 1/3 of the terrace population. For propylene, two different C 1s binding energies can be related to the three carbon atoms. On Pt(355), a structureless peak results from additional step contributions. For both adsorbates, the respective alkylidin species appears as the major dissociation intermediate. Differences in thermal reactivity between flat and stepped Pt are observed for both molecules in temperature-programmed (TP-) XPS experiments.

This work was supported by BMBF (05 ES3XBA/5).