Oxygen K-edge near edge X-ray absorption fine structures of O and OH overlayers on Pt(111)

O K-edge near edge X-ray absorption fine structure (NEXAFS) spectra of atomic O and OH adsorbates on Pt(111) were measured and interpreted by theoretical calculations based on the multiple scattering and molecular orbital methods. Comparison of the observed and calculated spectra from OH/Pt(111) confirmed that the OH species adsorb on the atop site with the O-H bond tilted from the surface normal. The spectra from O/Pt(111) were well reproduced by the structural model proposed by the previous LEED analysis that O is located at the hollow site with 1.19 A above the Pt top layer.