Abstract
The surface structure and the electronic property of submonolayer carbon disulfide CS 2 adsorbed molecularly on Cu(100) at 106 K were investigated by means of S K-edge surface extended X-ray absorption fine structure (SEXAFS), near edge X-ray absorption fine structure (NEXAFS) and X-ray photoelectron spectroscopy (XPS) measurements. The CS 2 molecule is found by NEXAFS to lie nearly flat on the surface with a small tilt angle of the molecular axis from the surface. The π∗ resonance intensity in NEXAFS suggests that the adsorbed species is in the state of CS 1.3− 2. SEXAFS has clarified the adsorption geometry of the CS 2 molecule; the molecule adsorbs asymmetrically with the two S atoms respectively locating at the fourfold hollow site and closely to the bridge site. Such an adsorption structure is quite similar to submonolayer CS 2 on a Cu(111) surface.
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