Abstract
X-ray photoelectron spectroscopy (XPS) spectra are presented for two different preparations of a Cr2O3(101¯2) single crystal surface. A nearly stoichiometric surface is prepared by Ar-ion bombardment and annealing to 900 K in vacuum. An oxygen-terminated surface is prepared by dissociative adsorption of O2. Both surfaces exhibit (1 × 1) LEED periodicities. XPS shows a slight broadening (0.2 eV) and an increase in intensity of the O 1s feature following O2 adsorption. The increase in oxygen signal is representative of a coverage of nearly one oxygen atom per surface Cr cation.
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