Regensburg 2004 – scientific programme

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O: Oberflächenphysik

O 14: Postersitzung (Adsorption an Oberflächen, Epitaxie und Wachstum, Organische Dünnschichten, Oxide und Isolatoren, Phasenübergänge, Rastersondentechniken, Struktur und Dynamik reiner Oberflächen)

O 14.9: Poster

Monday, March 8, 2004, 18:00–21:00, Bereich C

CO adsorption and desorption processes on Pt(355) investigated by in-situ high resolution XPS — •B. Tränkenschuh, T. Fuhrmann, C. Papp, J. F. Zhu, R. Denecke, and H.-P. Steinrück — Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen

The adsorption and thermal desorption of CO on a Pt(355) surface was studied by the combination of a supersonic molecular beam and in-situ high resolution XPS. This surface contains five atom wide (111) terraces separated by monatomic steps with (111) orientation. By using synchrotron radiation we are able to clearly distinguish between adsorption sites at steps and at terraces in O 1s and C 1s spectra, even at fast measuring times (about 4 s per spectrum). The terrace adsorption sites are comparable to those on a Pt(111) surface, namely bridge and on-top bound species which are well known in literature [1]. Our measurements show that first the step sites and than the on-top and bridge sites on the terraces are occupied. The desorption is studied by temperature-programmed XPS and TPD. Supported by the DFG (STE 620/4-2).

[1] M. Kinne et al., J. Chem. Phys. 117, 23 (2002).