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Gierer, Martin and Bludau, Horst and Hertel, Tobias and Over, Herbert and Moritz, Wolfgang and Ertl, Gerhard (1992): Coverage-dependent adsorption sites in the K/Ru(0001) system: a low-energy electron-diffraction analysis. In: Surface Science, Vol. 279, No. 1-2: L170-L174
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Abstract

The two ordered phases p(2 × 2) at a coverage θ = 0.25 and (√3 × √3)R30° at θ = 0.33 of potassium adsorbed on Ru(0001) were analyzed by use of low-energy electron-diffraction (LEED). In the (√3 × √3)R30° phase, the K atoms occupy threefold hcp sites, while in the p(2 × 2) phase the fcc site is favoured. In both phases, the K hard-sphere radii are nearly the same and close to the covalent Pauling radius.