Abstract
The adsorption of oxygen onto a Ru(0001)-(2 x 2)-Cs phase with coverage ΘCs = 0.25 gives rise to the formation of a Ru(0001)-(2√3 x 2√3)R30°-3Cs-20 coadsorption structure with three cesium and two oxygen adatoms in the unit cell. A low-energy electron-diffraction (LEED) analysis reveals that oxygen is located in threefold hollow sites on the Ru surface while the Cs atoms remain near on-top sites; this site was also found in the pure Ru(0001)-(2 x 2)-Cs phase. The oxygen-Ru bond length of (2.14 ± 0.05) Å is longer by 0.11 A than in the Ru(0001)-(2x2)-0 phase, indicating that the Ru-O bond is weakened in the presence of coadsorbed Cs. The Cs hard sphere radius of (1.75 ± 0.07) Å is close to the ionic Pauling radius of 1.69 Å
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