Low-energy electron diffraction analysis of the structure of a Cs-O/Ru(0001) coadsorbate phase
b'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.'