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Oxygen adsorption on Ag(lll)

We have investigated the interaction of oxygen with Ag(lll) by using a supersonic molecular beam in the impact energy range 93-800 meV. At 105 K, contrary to the results of Carley et al. [Surf. Sci. 238 (1990) L467], we find no evidence for O 2 adsorption even after very high O 2 exposures (~ 25000 L) indicating that for a clean surface the sticking probability S is lower than 6 X 10 -7 for the whole impact energy range. At room temperature dissociative oxygen adsorption occurs at E i = 0.80 eV, with S = 9 x 10 -7. The data show however evidence that the adsorption process is mediated also in this case by adsorbed OH so that S is even smaller for the clean surface.