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Abstract
The initial oxidation of poly-crystalline aluminum is investigated using x-ray photoelectron spectroscopy (XPS). The total oxygen coverage and the oxidic oxygen coverage are obtained from the O 1s and Al 2p peaks in the XPS spectra. A linear relationship is found between the total oxygen coverage and the oxidic oxygen coverage. The critical oxygen coverage representing the start of the nucleation process is determined to be 0.07 ± 0.02. It is proposed that the site-exchange process is caused by a repulsive interaction between a chemisorbed oxygen island and the aluminum substrate and the strength of this interaction increases with the size of the oxygen island. Based on this consideration, a simple model is introduced, which predicts a linear relationship between the total oxygen coverage and the oxidic oxygen coverage, in agreement with the experimental observation.
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