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 14.12: Poster

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

HR-XPS study of furan and pyrrole on Ni(111): reactions of unsaturated hetero ring systems — •C. Papp, R. Denecke, and H.-P. Steinrück — Physikalische Chemie II, Universität Erlangen-Nürnberg, Egerlandstr. 3, 91058 Erlangen

The examination of the two hetero-cycles, furan (C4H4O) and pyrrole (C4H5N) on the Ni(111) surface with temperature programmed XPS (TP-XPS) and temperature programmed desorption (TPD) was conducted in a larger effort to understand the adsorption and reaction of aromatic molecules on single crystal surfaces. The XP spectra of C 1s, O 1s and N 1s core levels were recorded with the high resolution and high flux of the third generation synchrotron source MAX II. In both hetero-cycles the inequivalent C atoms can be clearly resolved. The two molecules show significant differences in their reaction behavior. Furan decomposes at 200 K by forming CO, which is desorbing at 430 K, and hydrocarbon fragments. Pyrrole dissociates at 290 K, but shows no desorption of any nitrogen containing species up to 600 K, and even at 1000 K some nitrogen is left on the surface. For both molecules the thermal evolution of the hydrocarbon fragments is analysed. This work was supported by a European Community ARI Program (HPRI-CT-1999-00058).