Hamburg 2001 – wissenschaftliches Programm
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O: Oberflächenphysik
O 30: Oberfl
ächenreaktionen (III)
O 30.8: Vortrag
Donnerstag, 29. März 2001, 12:15–12:30, K
A temperature-programmed x-ray photoelectron spectroscopy study of the reaction of propene on Ni(100) — •Caroline Whelan, Ralf Neubauer, Reinhard Denecke, and Hans-Peter Steinrück — Universität Erlangen-Nürnberg, Physikalische Chemie II, Egerlandstr. 3, 91058 Erlangen, Germany
Temperature-programmed synchrotron radiation X-ray photoelectron spectroscopy (TP-XPS) has been used to investigate the adsorption and decomposition reaction of propene (C3H6) on the Ni(100) surface. Adsorption at 90 K results in multilayer formation at high exposures. Upon increasing the temperature to 125 K, multilayer desorption occurs leaving a chemisorbed C3H6 monolayer. Molecular desorption continues between 165 and 250 K accompanied by changes in the C 1s peak binding energies and relative intensities attributed to the formation of a new surface species. In agreement with a previous UPS study [Kleyna et al., Surf. Sci. 402-404 (1998) 131], these observations are assigned to a transformation from a π- to di-σ-bonded intermediate which is complete at the onset of the dehydrogenation reaction at 300 K leaving only carbidic carbon on the surface at 400 K. Work was supported by EU TMR program (ERB FMGE CT98 0124) and DAAD exchange program 313/S-PPP.