Abstract
The adsorption, desorption, surface structural chemistry, and reactivity of HCN adsorption layers on Pt(110) have been studied by LEED and thermal desorption mass spectrometry. HCN adsorbs at 300 K via a mobile precursor state, and induces a (1 × 2) → (1 × 1) change in the periodicity of the clean reconstructed Pt(110) surface. Desorption occurs yielding H 2, HCN and C 2N 2 in comparable quantities, and the observed behavior is accounted for in terms of associative desorption from a fully dissociated layer of H and CN species. A simple model is developed using lattice statistics which gives a fairly good account of the observed desorption spectra and their coverage dependence, both as regards peak temperature shifts and product distribution. Comparison of the observed and calculated spectra for C 2N 2 leads to the following conclusions: (i) the initial sticking probability of HCN is of the order of unity; (ii) H and CN occupy different kinds of adsorption site; (iii) CN itself is a “two-site” adsorbate at 300 K. c(2 × 4) and (1 × 1) LEED patterns due to adsorbed CN are observed which are consistent with this view; under certain conditions a more compressed, poorly ordered ¦ 1 2 3 , 1 2 3 ¦ structure is also observed.
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