Abstract
Surface structure and electronic properties of submonolayer sulfur dioxide SO 2 molecularly absorbed on Ni(110) have been investigated by means of S K-edge surface-extended X-ray absorption fine structure (SEXAFS), near-edge X-ray absorption fine structure (NEXAFS) and S 1s X-ray photoemission spectroscopy (XPS) measurements. The SO 2 molecule was found by SEXAFS and NEXAFS to adsorb with the molecular plane parallel to the surface and an elongated SO bond distance compared to that of a free molecule. The S atom was revealed to locate on the long- and short-bridge sites with almost equal probabilities. No azimuthal-angle dependence was detected as for the SO bond direction. A significant amount of charge transfer from the substrate to the SO 2 π∗ orbital was found by NEXAFS and XPS. Such structural and electronic properties are essentially similar to those of SO 2 on Ni(100) and Ni(111).
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