Abstract
A plane wave multiple scattering method employing simplified form factors has been used to determine the surface structure of annealed (110) faces of tungsten and molybdenum from existing LEED results. Assuming the validity of the method, it is found that these faces, after being annealed under LEED conditions, are probably covered by an overgrown monolayer sited directly above, and at a distance of 2.1 Å from, the terminal layer of the bulk structure. It is shown that ion bombardment removes this overgrown layer and reveals the bulk structure of Mo(110). Adsorbed CO on bombarded Mo(110) is shown to take up the α-sites, i.e. to position itself directly above the metal atoms, and, assuming similar form factors for the atoms in the adsorbate and adsorbent, to cover 60% of the surface.
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