Dependence of effective desorption kinetic parameters on surface coverage and adsorption temperature: CO on Pd(111)

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Abstract
The effective desorption kinetic parameters of CO on the Pd(111) surface have been studied by thermal desorptionspectroscopy. The zero coverage effective desorptionactivation 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 E d (θ) and the development of stable low‐energy electron desorption(LEED)structures was observed for the first time at T ads= 200 K. E d and ν1 showed a strong compensation effect with T c =519 K. The adsorption temperature dependence of E d from T ads=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.