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THE ORIENTATION OF MERCAPTIDE ON CU(111) STUDIED BY X-RAY PHOTOELECTRON DIFFRACTION POLAR ANGLE SCANS

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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. ISSN 0953-8984.

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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.

Item Type: Conference Item (UNSPECIFIED)
Subjects: Q Science > QC Physics
Journal or Publication Title: JOURNAL OF PHYSICS-CONDENSED MATTER
Publisher: IOP PUBLISHING LTD
ISSN: 0953-8984
Official Date: November 1991
Dates:
DateEvent
November 1991UNSPECIFIED
Volume: 3
Number: Suppl. A
Number of Pages: 5
Page Range: S111-S115
Publication Status: Published
Title of Event: 9TH INTERDISCIPLINARY SURFACE SCIENCE CONF ( ISSC-9 )
Location of Event: SOUTHAMPTON, ENGLAND
Date(s) of Event: APR 22-24, 1991

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