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An Electron-Stimulated Desorption Ion Angular Distribution and Low-Energy Electron Diffraction Investigation of CF3I on Ru(001)

We have investigated the structures of CF{sub 3}I, and its dissociation products, adsorbed on Ru(001) using low-energy electron diffraction and electron-stimulated desorption ion angular distribution (ESDIAD). Atomic iodine forms ({radical}3x{radical}3)R30{degree} islands even at very low coverages. At 70% of saturation and above, a (2 x 2) superstructure formswhich we attribute to a p(2 x 2) unit cell with one CF{sub 3} group and one iodine atom. ESDIAD images show F{sup +} desorbing at normal emission and in three hexagonal patterns. The normal emission is attributed to a tilted configuration of CF{sub 3}(ad) in which on C-F bond is oriented perpendicular to the surface. A small hexagon is attributed to F(ad) on step edges. A large hexagon at low coverages may arise from isolated CF{sub 3}(ad) species possessing C{sub 3v} symmetry. And finally, an intermediate hexagon is attributed to perturbation of the CF{sub 3}(ad) orientation by molecular fragments which result from electron irradiation of physisorbed CF{sub 3}I. 31 refs., 8 figs., 1 tab.