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Scanning tunnelling microscopy study of the interaction of dimethyl disulphide with Cu(111)

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UNSPECIFIED (2000) Scanning tunnelling microscopy study of the interaction of dimethyl disulphide with Cu(111). Surface Science, 457 (1-2). pp. 11-23. ISSN 0039-6028.

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Abstract

Scanning tunnelling microscopy has been used to study the interaction of dimethyl disulphide, (CH3S)(2), with Cu(111) at room temperature, which is known to produce adsorbed methanethiolate, CH3S-, by S-S bond scission at the surface. The results provide clear evidence for the formation of a pseudo-square surface reconstruction induced by the adsorbate; this reconstruction can be reconciled with the results of previous structural studies of this surface by the techniques of X-ray standing wave and surface extended X-ray absorption fine structure. Two further ordered adsorption phases are observed. One of these, a hexagonal honeycomb phase, is proposed to involve bridge and hollow site adsorption on an unreconstructed Cu surface and is metastable; it is identified as a methanethiolate species previously only studied at low temperature by photoelectron spectroscopy and X-ray standing waves. A third phase of hexagonal symmetry appears to be an alternative endpoint to the pseudo-square phase, but may be due to higher adsorbate coverages; the nature of the structure of the underlying copper surface in this case is unclear. (C) 2000 Elsevier Science B.V. All rights reserved.

Item Type: Journal Article
Subjects: Q Science > QD Chemistry
Q Science > QC Physics
Journal or Publication Title: Surface Science
Publisher: ELSEVIER SCIENCE BV
ISSN: 0039-6028
Official Date: 1 June 2000
Dates:
DateEvent
1 June 2000UNSPECIFIED
Volume: 457
Number: 1-2
Number of Pages: 13
Page Range: pp. 11-23
Publication Status: Published

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