Article,
Surface diffusion of CO on Pt(111): a HREELS study at high temperatures
Surf. Sci., 320 (1-2): 85 - 92 (1994)
DOI: DOI: 10.1016/0039-6028(94)00498-6
Abstract
Surface diffusion of CO on Pt(111) has been investigated with HREELS
for temperatures between 280 and 420 K by measuring the stationary
spatial variation of coverage produced on the Pt(111) surface by
permanent impact of a CO-nozzle beam for different elevated temperatures
at which the coverage is mainly controlled by the competition of
adsorption and desorption. The Arrhenius parametrization of the diffusion
coefficients yields Ediffapproximate52.4 kJ/mol and a prefactor
of 7.5�102�1 cm2/s. The data processing and the evaluation of the
coverage dependent diffusion parameters are discussed in detail.
The observed coverage dependence has been modelled by a simple random
walk model and the quantitative results are compared with those of
other studies.
