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O: Oberflächenphysik
O 11: Poster (I)
O 11.35: Poster
Monday, March 23, 1998, 19:30–22:30, Bereich C
Adsorption of oxygen on Ag(001): a molecular beam and HREELS study. — •U. Burghaus, L. Vattuone, U. Valbusa, and M. Rocca — CSFBT and INFM, via Dodecaneso 33, 16146 Genova, Italy, burghaus@genova.infn.it
O2/Ag has recently become a paradigm for the understanding of the dynamics of gas-surface interaction. We reinvestigated the non-dissociative oxygen adsorption on Ag(001) by the King and Wells method and by HREELS to extend the impact energy range to 1 eV and to investigate a possible vibrational enhancement of the adsorption probability. The initial adsorption probability increases with energy up to a maximum of 0.7, and decreases thereafter. No vibrationally enhancement was observed. A deviation from normal energy scaling is present over the whole impact energy range, which implyes at low impact energies a cosn(θ) with θ<2 while n>2 at large impact energy. The former effect indicates an influence of geometrical corrugatation on adsorption, although weaker than for Ag(110). At high impact energy n>2 because of the onset of geometric corrugation.