Abstract
Surface structures and electronic properties of submonolayer sulfur dioxide, SO 2, molecularly adsorbed on Ni(111) and Ni(100) at ∼ 170 K 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 photoelectron spectroscopy (XPS) measurements. NEXAFS and SEXAFS have clarified that on both surfaces the SO 2 molecule adsorbs with the molecular plane parallel to the surface and the elongated intramolecular SO bond lengths. The S atom directly interacts with substrate Ni, located at the bridge sites on both surfaces. Such adsorption geometries for submonolayer SO 2 on metal surfaces have never been reported before. Comparing to other SO 2 metal systems the determined surface structures are discussed in terms of chemical bonding.
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