Abstract
The dynamics of site exchange between CO molecules chemisorbed on step and terrace sites has been investigated using temperature programmed desorption. Isotopically labeled CO molecules adsorbed on stepped sites have been shown to completely randomize with CO molecule adsorbed on terrace sites during the temperature programmed experiment. This is consistent with an activation energy for CO migration under full coverage conditions, E m≤20 kcal/mol. In addition, intermolecular isotopic mixing process involving C-O bond scission have been shown to be absent on this surface. Finally, in contrast to similar experiments on Ni(100), it has been shown that the exchange process CO *(g)+CO(ads)→CO(g)+CO *(ads) is slow (or absent) at 220 K compared to the CO collision rate with the Pt(112) surface.
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