Abstract

We present low-energy electron diffraction (LEED) studies of a p(2 × 2) overlayer of oxygen, a monolayer of water and a multilayer ice film on Pt(111). Oxygen adsorbs in a fcc hollow site; buckling in the first two substrate layers leads to a local expansion of the substrate underneath the oxygen. Water adsorbs as a disordered monolayer and diffuse LEED intensities (DLEED) can be observed. From the structure of the diffuse background preferred next-neighbor distances can be concluded. A multilayer of water forms a thick molecular crystal of ice grown in (√3 × √3)R30° periodicity on Pt(111).

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