Abstract
The coadsorption and reaction of CO 2 with a layer of molecular oxygen preadsorbed on a Ag(110) surface have been studied with high resolution electron energy loss spectroscopy (HREELS). Clear evidence has been found for a direct reaction of CO 2 and O 2 to CO 3 at 100 K, resulting in a product coverage higher than attainable with atomic oxygen in the (2×1)O reconstruction. All internal modes of CO 3 have been detected, including the in-plane bend and the asymmetric stretch modes, which are degenerate at intermediate but split at saturation coverages. An intermediate species has been observed to be stable only in coadsorption with molecular oxygen, and has been tentatively assigned to a CO − 4 anion. The quantitative analysis of the isotopic shift observed with 13C 16O 2, 12C 18O 2 and 18O 2 is consistent with a planar adsorption geometry of a structurally unmodified CO 3 anion bound via the central carbon atom.
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