Zusammenfassung
The effective desorption kinetic parameters of CO on the Pd(111) surface
have been studied by thermal desorption spectroscopy. The zero coverage
effective desorption activation energy and the preexponential factor
were found to be 35.5 kcal/mol and 1013.5 s-1, respectively. As a
function of CO coverage, a four-stage correlation between Ed(theta)
and the development of stable low-energy electron desorption (LEED)
structures was observed for the first time at Tads= 200 K. Ed and
nu1 showed a strong compensation effect with Tc=519 K. The adsorption
temperature dependence of Ed from Tads=87 to 200 K was observed and
interpreted qualitatively by a model involving the production of
different domain structures at various adsorption temperatures and
the preservation of domain structures at higher coverages during
temperature programmed desorption.
Nutzer