Toomes, R, Polcik, M., Kittel, M., Hoeft, J.T., Sayago, D. I., Pascal, M., Lamont, C.L.A., Robinson, J. and Woodruff, D.P. (2002) Structure determination of methanethiolate on unreconstructed Cu(1 1 1) by scanned-energy mode photoelectron diffraction. Surface Science, 513 (3). pp. 437-452. ISSN 0039-6028
Metadata only available from this repository.Abstract
The local structure of methanethiolate, CH3S–, on an unreconstructed Cu(1 1 1) surface at low temperature, has been investigated by S 2p and C 1s scanned-energy mode photoelectron diffraction, with chemical state sensitivity. 71(+14/−16)% of the methanethiolate was found to occupy bridge sites, 29±14% to occupy fcc hollow sites and 0+19% to occupy hcp hollow sites. In the bridge site the layer spacing of the sulphur atom to the outermost substrate layer is 1.87±0.03 Å giving a Cu–S bondlength of 2.27±0.03 Å. The methanethiolate adsorbed in the fcc hollow site has a Cu–S layer spacing of 1.73±0.04 Å, corresponding to the same bondlength of 2.27±0.04 Å. The S–C bondlength was found to be 1.92±0.10 Å. These conclusions are consistent with the results of previous X-ray standing wave and scanning tunnelling microscopy studies for a common model involving co-occupation of bridge and hollow sites, although differing relative occupations and long-range ordering are thought to arise from different preparation conditions. The new data favour a model in which the S–C bond axis of the bridge-bound thiolate is tilted by 45±12° away from the surface normal in the azimuth directed towards the fcc hollow site.
Item Type: | Article |
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Uncontrolled Keywords: | Photoelectron diffraction; Chemisorption; Surface structure, morphology, roughness, and topography; Copper |
Subjects: | T Technology > TP Chemical technology |
Schools: | School of Applied Sciences |
Related URLs: | |
Depositing User: | Catherine Parker |
Date Deposited: | 06 Nov 2008 14:14 |
Last Modified: | 28 Aug 2021 10:42 |
URI: | http://eprints.hud.ac.uk/id/eprint/2564 |
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