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Abstract:
The formation of carbonate species (CO3) on Ag(100) by exposure of the (4×1) oxygen-reconstructed surface to CO2 has been studied with high-resolution electron energy loss spectroscopy (HREELS). The position and shape of the CO3-related loss peaks were found to depend on the long-range order in the carbonate layer, as observed with LEED. In addition to the γ, νs and νas modes of CO3 at 833, 1050 and 1343 cm−1, two separate peaks in the Ag–CO3 frequency region occur at 277 and 239 cm−1. The latter is particularly sensitive to disorder. Coadsorbed CO2, which is stabilized by the CO3, exhibits vibrations that are almost unchanged compared to the gas phase values, although the Fermi resonance appears to be largely suppressed.
