Abstract
The extent of CO adsorption has been measured at 295 K and the thermal desorption of CO has been followed on Ni and NiCu films prepared in an ultrahigh vacuum apparatus. The total extent of adsorption revealed a different behavior than the extent of hydrogen adsorption studied previously; an explanation involving gas-induced surface enrichment of alloys is suggested. An irreversible gas-induced enrichment has also been observed upon repeated runs of the thermal desorption of CO. The thermal desorption reveals the existence of two weakly bound states γ1 and γ2 and two more strongly bound states α1 and α2 on Ni and Ni alloys. Cu reveals only the weakly bound states γ1 and γ2. The population of various states varies with the Cu content as well as the chemisorption bond strength of the α2-species. Suggestions are made on the adsorption modes of CO.
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