UNSPECIFIED (1991) THE ORIENTATION OF MERCAPTIDE ON CU(111) STUDIED BY X-RAY PHOTOELECTRON DIFFRACTION POLAR ANGLE SCANS. In: 9TH INTERDISCIPLINARY SURFACE SCIENCE CONF ( ISSC-9 ), SOUTHAMPTON, ENGLAND, APR 22-24, 1991. Published in: JOURNAL OF PHYSICS-CONDENSED MATTER, 3 (Suppl. A). S111-S115.

Abstract

The orientation of mercaptide (CH2S-), and the closely similar methoxy (CH3O-) species on Cu single-crystal surfaces, has been the subject of some controversy. Some near-edge x-ray absorption fine structure results indicate substantially tilted C-S or C-O molecular axes relative to the surface normal, but reflection-adsorption infrared spectroscopy of methoxy on Cu(111), scanned-energy mode photoelectron diffraction of methoxy on Cu(100), and S K-edge surface extended x-ray absorption fine structure of mercaptide on Cu(111) all indicate perpendicular molecular orientations. A technique that provides particularly clear information on molecular orientations is polar angle scanned x-ray photoelectron diffraction, and we have applied this method to a study of the molecular orientation of mercaptide on Cu(111). The results show clearly that the mercaptide molecular axis is oriented perpendicular to the surface, a result which is found to be true over a wide range of surface coverages. The origins of the discrepancies between the various techniques are discussed.

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