Abstract
The initial stages of oxygen chemisorption on Cr(110) at 300 K have been investigated using high resolution electron energy loss spectroscopy (HREELS), electron stimulated desorption ion angular distributions (ESDIAD), low energy electron diffraction (LEED), and Auger electron spectroscopy (AES). Dissociative chemisorption occurs with near unit sticking probability, leading to an ordered p(4 × 2)O overlayer at θ o ⋍ 1 8 . A model with atomic oxygen located in the two-fold symmetric hollow sites is proposed. The previously reported c(3 × 1)O overlayer was not observed in this study. A disordered oxygen adlayer is found as θ o increases. ESDIAD and HREELS data suggest that chemisorbed oxygen atoms occupy inequivalent local binding sites for θ > 0.25; subsurface oxygen is not found under these mild oxidation conditions.
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