Abstract
The method of determining the orientation of an adsorbed molecule by angle-resolved photoemission with polarised light has been applied to the case of water adsorbed on clean copper (110). By using dipole selection rules and symmetry arguments, it is found that in the full monolayer as well as at submonolayer coverages, the water molecules are adsorbed in a tilted geometry. Only small shifts in the valence photoemission peak relative to the gas phase spectrum are found, indicative of a weak chemisorption bond. These results are explained, by recourse to LEED observations, in terms of recent models of water layers on metal surfaces.
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