Abstract
The interaction of O 2 with clean annealed CuNi(110) surfaces of variable surface composition has been studied by means of Auger electron spectroscopy (AES), X-ray photo electron spectroscopy (XPS) and work function measurements (Δφ). Similar to the results from the clean Ni(110) and Cu(110) surfaces two different stages of oxygen bonding and reactions have been detected. In the first (chemisorption) stage, as indicated by AES and work function measurements on surfaces with medium and high Cu surface concentrations, a Ni enrichment combined with a reconstruction seems to occur. In the second stage oxide nucleation is found at oxygen doses higher than 10 L independent of the surface composition. However, the reaction rate for oxide growth decreases with increasing Cu surface concentration. From the attenuation of the Cu and Ni(M 1VV) Auger transitions, a preferential oxidation of Ni is suggested. The formation of NiO is confirmed by XPS measurements in which the Ni 2p spectrum reveals a shifted peak and characteristic satellite structures due to Ni 2+.
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