Lee, J. J., Fisher, C. J., Bittencourt, C., Woodruff, D. P., Chan, A. S. Y. and Jones, R. G.. (2002) A structural study of the interaction of methanethiol with Pt(111) using X-ray standing waves. Surface Science, 516 (1-2). pp. 1-15. ISSN 0039-6028

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Abstract

In combination with surface characterisation by synchrotron radiation X-ray photoelectron spectroscopy, the normal incidence X-ray standing wave (NIXSW) technique has been applied to a determination of the structure of surface phases formed on Pt(1 1 1) by reaction with methanethiol. On surfaces heated to > approximate to500 K, producing only coadsorbed atomic S and C, the S atoms are found to occupy fcc hollow sites (directly above Pt atoms in the third layer) in a geometry essentially identical to that of simple ordered S overlayer phases on Pt(1 1 1) with a S-Pt layer spacing of 1.67 Angstrom, but with possible fractional co-occupation of a complex S phase. On a surface annealed to approximate to223 K only a surface methanethiolate (CH3S-) species is believed to be present, the favoured model involves a tilted off-atop bonding such that the S atoms are located offset from the fcc hollow sites, with frustrated rotational vibrations of large amplitude, although an alternative model based on co-occupation of atop and fcc hollow sites is also consistent with the NIXSW data. (C) 2002 Elsevier Science B.V. All rights reserved.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry Q Science > QC Physics
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Surface Science
Publisher:	Elsevier Science BV
ISSN:	0039-6028
Date:	10 September 2002
Volume:	516
Number:	1-2
Number of Pages:	15
Page Range:	pp. 1-15
Identification Number:	10.1016/S0039-6028(02)02038-1
Status:	Peer Reviewed
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/10558

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