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A structural study of the interaction of methanethiol with Pt(111) using X-ray standing waves
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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. doi:10.1016/S0039-6028(02)02038-1 ISSN 0039-6028.
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Official URL: http://dx.doi.org/10.1016/S0039-6028(02)02038-1
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 | ||||
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| Subjects: | Q Science > QD Chemistry Q Science > QC Physics |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Surface Science | ||||
| Publisher: | Elsevier Science BV | ||||
| ISSN: | 0039-6028 | ||||
| Official Date: | 10 September 2002 | ||||
| Dates: |
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| Volume: | 516 | ||||
| Number: | 1-2 | ||||
| Number of Pages: | 15 | ||||
| Page Range: | pp. 1-15 | ||||
| DOI: | 10.1016/S0039-6028(02)02038-1 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published |
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