Abstract
The initial growth of water molecules to form the first bilayer and then ice layers on Ru(001) was studied utilizing work function change (ΔΦ), temperature programmed desorption (TPD), and supersonic atomic beam−collision-induced desorption (CID) measurements. A kinetic model that reproduces the first bilayer growth, as determined by the ΔΦ measurements, was developed. It indicates that monomers dominate the cluster size distribution at low coverages, but at high coverages, tetramers gradually become the dominant clusters. Small contributions to ΔΦ suggest that tetramers are cyclic at the adsorbed state with inclined dipoles. CID measurements of H2O and D2O at coverages near one bilayer reveal strong selectivity to the removal of molecules in the A2 adsorption sites over those in the icelike C sites and the A1 sites. Soft removal rates of thicker ice layers as a result of CID with energetic Kripton atoms were then studied as a function of the ice layer thickness. Near the completion of the third bilayer, ...
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