The local adsorption site of methylthiolate on Au(111): Bridge or atop?

SURFACE SCIENCE

卷:603

Article

Jackson, D. C.¹  Chaudhuri, A.¹  Lerotholi, T. J.¹  Woodruff, D. P.¹  Jones, Robert G.²  Dhanak, V. R.^3,4 

[1] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[2] Univ Nottingham, Sch Chem, Nottingham NG7 2RD, England

[3] Univ Liverpool, Surface Sci Res Ctr, Warrington WA4 4AD, Cheshire, England

[4] SERC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England

关键词: Photoelectron diffraction;    X-ray standing waves;    Chemisorption;    Self-assembly;    Gold;    Thiols;   

DOI  :  10.1016/j.susc.2009.01.022

来源: Elsevier

【 摘 要 】

Measurements of the local adsorption geometry of the S head-group atom in the Au(1 1 1)(root 3 x /3)R30 degrees-CH3S surface have been made using normal incidence X-ray standing waves (NIXSW) and S Is scanned-energy mode photoelectrom diffraction on the same Surface preparations. The results confirm that the local adsorption site is atop an Au atom in a bulk-continuation site with a S-Au bondlength of 2.42 +/- 0.02 angstrom, and that there can be no significant fraction of coadsorbed bridging species as recently proposed in a combined molecular dynamics/experimental study by Mazzarello et al. [R. Mazzarello, A. Cossaro, A, Verdini, R. Rousseau, L. Casalis, M.F. Danisman, L. Floreano, S. Scandolo, A. Morgante, G. Scoles, Phys. Rev. Lett. 98 (2007) 016102]. The results do not, however, clearly distinguish the different local reconstruction (adatom) models proposed for this surface. (c) 2009 Elsevier B.V. All rights reserved.

【 授权许可】

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