Abstract
Atomic oxygen, associatively adsorbed oxygen and the carbonate species on Ag(110) have been studied using valence level photoelectron spectroscopy. For the (3×1) atomic oxygen overlayer dispersion of an O-2p-induced feature above the Ag d band is observed, indicative of adsorbate band formation. In the associatively adsorbed species it appears that the former 1 π g molecular orbital ( a 2+ b 1 in C 2 v ) is completely filled as a result of the interaction with the surface. Despite the very strong lowering of the O-O stretching frequency observed in EELS, the 3 σ u ( a 1) orbital is apparently not occupied. The electronic structure of the surface carbonate is shown to be similar to that of a bulk carbonate, confirming the conclusions of Madix.
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