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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 ^* resonance and resembles a single-bonded peroxo species. The O-O bond is aligned parallel to the surface, along the 110 azimuth, with a bond length of 1. 470. 05 A. O₂ on Pt (111) also lies down but is less perturbed from the gas phase as revealed by the presence of a ^* resonance and an O-O bond length at 1. 320. 05 A, characteristic of a superoxo species.
Outka et al. (Sun,) studied this question.