AN EXPERIMENTAL INVESTIGATION OF THE DISSOCIATION OF H2O ON O(NX1)-AG(110) - FORMATION OF OH(1XM) ORDERED LAYERS

摘要

Water adsorption on the oxygen-covered Ag(110) surface has been studied by a combined analysis of structural properties (by helium diffraction) and of electronic states at the surface (by metastable deexcitation and angle-resolved ultraviolet photoemission spectroscopies). H2O adsorption on well ordered O(n X 1) phases (n even) leads to the observation of pure OH(1 x m) phases with m = n/2. Spectroscopic data indicate that OH is bonded to the surface via the O atom. The most distinctive spectral feature induced by OH(a) is the dispersion of electronic states in the 2-4 eV binding energy range, above Ag4d bands, along (1