Abstract
Surface electronic properties of submonolayer sulfur dioxide SO 2 molecularly adsorbed on Ni(100) have been investigated by means of ultraviolet photoelectron spectroscopy (UPS) and O K-edge near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. NEXAFS has confirmed that the SO 2 molecule is lying flat on the surface and significant charge transfer occurs from the substrate to the π ∗ orbital. UPS has directly clarified a partial occupancy of the π ∗ level, and correspondingly the π level was found to shift to a lower binding energy more significantly than other orbitals. It has been clearly elucidated that the SO 2 molecule acts as a π acceptor upon adsorption on the Ni(100) surface.
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