CO and H sub(2O adsorption and reaction on Au(310))

We have studied desorption of super(13CO and H) sub(2)O and desorption and reaction of coadsorbed, super(13CO and H) sub(2)O on Au(310). From the clean surface, CO desorbs mainly in, two peaks centered near 140 and 200 K. A complete analysis of desorption spectra, yields average binding energies of 21 +/- 2 and 37 +/- 4 kJ/mol, respectively. Additional desorption states are observed near 95 K and 110 K. Post-adsorption of H sub(2O displaces part of CO pre-adsorbed at step sites, but does not lead to CO oxidation or significant shifts in binding energies. However, in combination with electron irradiation, ) super(1)3CO sub(2 is formed during H) sub(2)O desorption. Results suggest that electron-induced decomposition products of H sub(2O are sheltered by hydration from direct reaction with CO.)