Abstract
The adsorption of oxygen by aluminum was studied using secondary ion mass spectrometry at low primary ion energies (⩽ 500 eV) and low primary ion fluxes (⩽ 5 × 10 10 ions/ cm 2/ sec) in an ultrahigh vacuum system. The SIMS characteristics of a cleaned aluminum surface were measured and yield changes of positive and negative ions were measured as a function of oxygen exposure. The results strongly support a model of oxygen uptake in two stages, the first monolayer equivalent being mostly incorporated into the aluminum, probably in the second layer and the next half-monolayer equivalent being superficially chemisorbed. Selection of the correct model is important in calculations of the resonances in the electronic (valence band) structure of free-electron-like metals caused by oxygen adsorption.
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