Abstract
We investigated the adsorption of argon on alkali metals (K,Cs) grown on Ru(001) by temperature programmed desorption (TPD). TPD spectra are characteristic for non-wetting, and the coverage dependence of the desorption energy can be explained in a simple droplet model. Nevertheless, the initial sticking coefficient s 0is not affected by nucleation and is thus determined by the interaction of Ar atoms with the alkali metal surface. The s 0 values can be understood quantitatively within a semiclassical forced oscillator model with reasonable interaction parameters. For Ar Cs , the measured gas temperature dependence gives access to the combined Morse potential parameters D and α, although they cannot be determined independently. Quantum effects in the sticking [1] are expected for Ar K .
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