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Adsorption of oxygen on Cu(100). II. Molecular adsorption and dissociation by means of O K -edge x-ray-absorption fine structure

1993; American Physical Society; Volume: 48; Issue: 20 Linguagem: Inglês

10.1103/physrevb.48.15405

1095-3795

Tetsuya Yokoyama, D. Arvanitis, T. Lederer, M. Tischer, L. Tröger, K. Baberschke, Giovanni Comelli,

Electron and X-Ray Spectroscopy Techniques

The structural and dynamical properties of molecular oxygen in submonolayer coverage adsorbed on Cu(100) were investigated by means of oxygen K-edge photoabsorption. The adsorption geometry of the ${\mathrm{O}}_{2}$ molecules, as well as the disorder and anharmonic contributions to the pair distribution function for the first-nearest-neighbor O-Cu shell were quantitatively determined for well-defined sequential molecular states of physisorption and chemisorption. The ${\mathrm{O}}_{2}$ molecules are found to adsorb in a tilted configuration. Furthermore, the O-Cu interatomic pair potentials are estimated. It is found that the nearest-neighbor O-Cu bond varies only slightly as the strength of chemisorption increases, in opposition to a strong O-O bond length and other O-Cu pair-potential parameter variations.