Abstract
The structure of the clean, (001) oriented single crystal surface of a platinum alloy containing 20 at% of cobalt was studied by low energy electron diffraction, low energy ion scattering spectroscopy and X-ray photoelectron spectroscopy. The bulk structure of the alloy is fcc, with cobalt atoms randomly substituting Pt atoms. He+ LEISS and angle resolved XPS results were consistent with a model of the surface where the outermost layer is strongly enriched in platinum and the second layer is enriched in cobalt. LEED showed that the (001) oriented surface exhibits a complex pattern which can be interpreted in terms of a reconstructed surface layer.
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