Abstract
H 2O adsorption on Cs predosed Ru(001) surfaces (with θ Cs = 0.08, 0.25 and 0.33 (= Cs monolayer)) at 90 and 300 K has been investigated using high resolution electron energy loss spectroscopy (HREELS). For θ Cs = 0.08, H 2O adsorbs molecularly at 90 K and monomeric H 2O is observed at small H 2O exposures. H 2O reacts with the metallic Cs layer for θ Cs = 0.25 and 0.33. While for θ Cs = 0.25 dissociation into H ad+OH ad is observed, complete dissociation into 2H ad + O ad occurs for θ Cs = 0.33. The chemical reactivity of the Cs adlayer increases according to its gain of metallicity with the increase of atomic density. Possible structural models for the (2 × 2)-(Cs + OH + H) overlayer on the Ru(001) surface are discussed.
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