Abstract
Oxidation of YCu intermetallic compound on the Cu(100) surface at room temperature has been studied by X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy. It is found that the YCu compound films are easily oxidized to form ytrium oxide at room temperature. The formed oxide prevents the Y atoms from diffusing into the topmost surface. Valence band and core level photoelectron spectra indicate the presence of chemisorbed oxygen species (O −) which are formed on top of the yttrium oxide at high oxygen exposure. On annealing, the O − ions can react with metallic yttrium continuously at medium temperature, and a uniform Y 2O 3 layer is formed on the Cu(100) surface.
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