Low-energy electron diffraction analysis of the structure of a Cs-O/Ru(0001) coadsorbate phase
The structure of the (\u221a3 \xd7 \u221a3 )R30\xb0 overlayer formed by coadsorption of Cs and O atoms (\u03b8Cs=\u03b80=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.