Near-edge x-ray-absorption fine-structure studies of O₂ chemisorbed on Ag(110) and Pt(111) surfaces near 100 K reveal different predissociation stages of molecular oxygen. O₂ on Ag(110) exhibits only a σ* resonance and resembles a single-bonded peroxo species. The O-O bond is aligned parallel to the surface, along the [11{}0] azimuth, with a bond length of 1.47±{}0.05 A{}. O₂ on Pt(111) also lies down but is less perturbed from the gas phase as revealed by the presence of a π* resonance and an O-O bond length at 1.32±{}0.05 A{}, characteristic of a superoxo species.
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Outka et al. (1987) studied this question.
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