Cm. Whelan et al., A fast x-ray photoelectron spectroscopy study of the adsorption and temperature-dependent decomposition of propene on Ni(100), J CHEM PHYS, 115(17), 2001, pp. 8133-8140
Using synchrotron radiation, the adsorption and decomposition of propene (C
3H6) on the Ni(100) surface has been investigated in situ by time-resolved
and temperature-programmed x-ray photoelectron spectroscopy. At 105 K, high
-resolution C 1s spectra indicate precursor mediated occupation of a single
adsorption state from submonolayer to monolayer coverage with evidence of
adsorbate-adsorbate interactions and dispersed phase growth. High exposures
lead to the formation of multilayers which desorb above 105 K leaving a ch
emisorbed monolayer. Between 105 and 150 K, a shift of the binding energies
in the C 1s spectra is attributed to the transition from pi- to di-sigma -
bonded propene. An abrupt change in the photoemission spectra occurs at 200
K due to the conversion of di-sigma -bonded propene to a C-3 intermediate
containing a methyl group. Formation of this C2HxCH3 surface species is com
plete at 300 K and is immediately proceeded by dehydrogenation to carbidic
carbon which is the final decomposition product above 370 K. (C) 2001 Ameri
can Institute of Physics.