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Small, size-selected Cr n clusters deposited onto Ru(001) have been studied by soft X-ray absorption spectroscopy. Broad, bulk-like L 3 absorption line shapes are observed for all clusters. Sizeable shifts in X-ray absorption energy after flash heating are indicative of diffusion or surface alloying. Pure Cr n clusters can be easily oxidised, yielding Cr 2 O 3 ...
The previously reported dependence of the dissociative sticking probability of oxygen on the Ag(110) surface has been modeled as a random walk between selective adsorption and desorption sites on the surface. Chemisorbed oxygen molecules are allowed to move on an anisotropic surface between boundaries representing the AgO added rows and surface steps. Molecules that encounter the added rows are forced...
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