The structure of the ({}3 ×{} {}3 )R30^∘{} overlayer formed by coadsorption of Cs and O atoms (θCs=θ₀=0.33) on a Ru(0001) surface was determined by low-energy electron diffraction. Both adsorbates occupy hcp-type hollow sites. If compared with the structures of the respective pure adsorbate phases, the bond lengths are modified in a way consistent with an effective transfer of electronic charge from Cs to O.
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Over et al. (1992) studied this question.
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