Abstract
A high-energy ion scattering study reveals that oxide layers on Fe(100) and Fe(110) have different average stoichiometries if the oxides are grown at room temperature. On Fe(110), Fe 2O 3 is observed, in contrast with Fe(100) where Fe 0.95O has been observed. This difference persists if the surfaces are precovered with one monolayer platinum. On the basis of the stoichiometries the geometrical thicknesses at which the oxidation process saturates at room temperature is found to be equal for both surfaces, despite the larger oxygen uptake by the Fe(110) surface in saturation. Equal thicknesses are in agreement with the Fromhold-Cook theory of metal oxidation.
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