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Oxygen-induced reconstruction of a Pt-Rh(100) alloy surface was studied by scanning tunneling microscopy (STM). When a clean Pt-enriched Pt-Rh(100) surface was exposed to O 2 at more than 600 K, oxygen-induced reconstruction took place with segregation of Rh atoms to the surface. Depending on the coverage of oxygen, two types of reconstruction on the Pt-Rh(100) alloy surface are induced....
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