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The structure of atomic sulfur phases on Au(111)
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Yu, Miao, Ascolani, H., Zampieri, G., Woodruff, D. P., Satterley, C. J., Jones, Robert G. and Dhanak, V. R. (2007) The structure of atomic sulfur phases on Au(111). Journal of Physical Chemistry C, Vol.111 (No.29). pp. 10904-10914. doi:10.1021/jp072088+
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Official URL: http://dx.doi.org/10.1021/jp072088+
Abstract
The structural phases formed by atomic sulfur on Au(111) due to reaction with molecular S-2 have been investigated by qualitative low-energy electron diffraction (LEED), scanning tunneling microscopy, and normal incidence X-ray standing wavefield absorption (NIXSW) combined with X-ray photoelectron spectroscopy (XPS). Three phases are identified with increasing coverage, namely, a newly identified (5 x 5) phase, a (root 3 x root 3)R30 degrees phase, and a "complex" phase. The (5 x 5) phase, with a LEED pattern having the appearance of a "split-spot" (root 3 x root 3)R30 degrees pattern, is interpreted in terms of local (root 3 x root 3)R30 degrees ordering within a (5 x 5) ordered domain structure. The S atoms in the (5 x 5) phase occupy fcc hollow sites 1.56 A above the outermost extended Au(111) bulk atomic scatterer plane. A specific model of the ordering in this phase is proposed that, together with the observed marginal stability of the true, long-range-ordered, (root 3 x root 3)R30 degrees phase, indicates significant short-range S-S repulsion and probably compressive surface stress. The complex phase, that coexists in a poorly ordered state with the lower coverage atomic chemisorption phases, is interpreted in terms of an incommensurate long-range periodicity, but the NIXSW data shows clear evidence of local commensuration, with the S atoms mainly close to atop sites relative to the underlying Au(111) substrate; these data provide strong support for a previously proposed model based on a sulfide layer of stoichiometry AuS.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QD Chemistry T Technology T Technology > TA Engineering (General). Civil engineering (General) |
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| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||
| Journal or Publication Title: | Journal of Physical Chemistry C | ||||
| Publisher: | American Chemical Society | ||||
| ISSN: | 1932-7447 | ||||
| Official Date: | 26 July 2007 | ||||
| Dates: |
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| Volume: | Vol.111 | ||||
| Number: | No.29 | ||||
| Number of Pages: | 11 | ||||
| Page Range: | pp. 10904-10914 | ||||
| DOI: | 10.1021/jp072088+ | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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