Abstract
The structures of five different submonolayer commensurate phases of Cs on Ag(111) have been determined by low energy electron diffraction (LEED). This paper presents the results of two of these studies: for the primitive (2 3 ×2 3 )R30° and ( 7 × 7 )R19° structures which form at coverages of 1/12 and 1/7 respectively. The adsorption site was found to be the fcc hollow in both cases. These structures are accompanied by a substrate rumple which has the effect of allowing the Cs atoms to push deeper into the substrate. The structures determined here, along with the earlier structure determinations of three other submonolayer phases, indicate that the CsAg bond length does not change over the coverage range from 1/12 to the monolayer saturation coverage of 1/3.
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