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8. Chemisorption at both Tℓ and Th is describable in terms of a mobileprecursor kinetics, with initial sticking probabilities of about 0.77 and 0.23, respectively. At Tℓ, chemisorption is greatly inhibited by the presence of a preadsorbed layer of oxygen that is atomic and ordered. A more detailed description of the adsorption kinetics is given in ref. .
9. An examination of the Cu 2p lines showed no indication of copper-oxygen bonding and was no help in resolving this issue. Within experimental uncertainty, the relative intensities and binding energies of these peaks were the same for each surface condition studied in this work.