Abstract
The surface-reaction of hydrogen with uranium in the presence of Pt clusters was studied using scanning tunnelling microscopy (STM). Uranium was deposited on highly oriented pyrolytic graphite (HOPG) and annealed at temperatures up to 1200°C to obtain atomically flat surfaces. Platinum clusters were then formed using evaporation from a Pt source onto the surface and were subsequently annealed. As a result, hydrogen primarily attacked U in the vicinity of Pt clusters and formed hydride, which expanded non-linearly over time. A simple model to explain this expansion behavior is proposed.
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