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Abstract:
The Al203/NiAl(ll0) system with and without Pd clusters on the surface has been studied using has been deposited under various conditions, and changes in the spectra due to differences in growth modes are discussed. The C ls spectra for CO adsorbed on deposited Pd clusters of increasing size can be viewed as showing the evolution from a deposited carbonyl-like species to CO adsorbed on a metallic surface. Heating of CO-saturated clusters to 300 K leads to desorption of more than half of the CO, which allows for a stronger interaction between the remaining molecules and the Pd clusters.