Abstract
The interaction of O 2 with a Cu(111)-Ni alloy and the reaction of sorbed oxygen with H 2 has been investigated with ellipsometry and AES. The surface alloys were prepared by dissociation of nickel carbonyl on a clean Cu(111) surface. Sorption of O 2 can be described by a precursor state model for dissociative chemisorption followed by a first order reaction of adsorbed oxygen atoms to incorporated oxygen atoms. The initial sticking probability is 10 -3 at room temperature and increases with increasing crystal temperature. The first chemisorption of O 2 on a freshly prepared alloy surface causes an irreversible surface reconstruction. The amount of oxygen in the near surface layer decreases with increasing crystal temperature. The reaction of sorbed oxygen with H 2 can be described by a nucleation and growth mechanism with a time dependent number of growth centers. The rate is strongly affected by an operating ionisation gauge.
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