Abstract
We present an experimental and theoretical study of the angular distribution of electrons resonantly scattered by physisorbed O 2 Ag(110) . The shape of the angular distribution, obtained from high-resolution electron energy-loss spectra (HREELS), changes as the coverage is increased from the monolayer to the multilayer regime. With the aid of a classical model which takes into account both the azimuthal and polar orientation of the molecule with respect to the surface and employs structural parameters deduced from X-ray absorption experiments, we find that this result can be attributed to a change in orientation of the molecules in the multilayer compared with the monolayer regime.
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