Abstract
The interaction of oxygen with Pt(111) and Pt(557) faces was studied by photoemission using synchrotron radiation and conventional X-ray sources. The difference in escape depth between the two systems enables us to distinguish surface as well as underlayer events. With Pt(111) the surface contribution of the Pt4f peak alone is affected by oxygen exposure. With Pt(557), both surface and bulk contributions show interaction with oxygen, giving rise to a superficial platinum oxide. This special behaviour of the Pt(557) face is attributed to the role played by the (100) ledges.
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