Structure investigation of Ag(111)(√7x-√7)R19°-SCH3 by X-ray standing waves:: A case of thiol-induced substrate reconstruction

被引：29

作者：

Yu, M

Woodruff, DP ^{[1
]}

Bovet, N

Satterley, CJ

Lovelock, K

Jones, RG

Dhanak, V

机构：

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

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

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

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

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2006年 / 110卷 / 05期

关键词：

D O I：

10.1021/jp0552325

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The structure of the Ag(111)(root 7 x root 7)R19 degrees-CH3S surface phase, formed by interaction of Ag(l 11) with gas-phase dimethyl disulfide, (CH3S)(2), has been investigated by normal-incidence X-ray standing wave (NIXSW) analysis, using (111), ((1) over bar 11), and (200) Bragg reflections. The resulting NIXSW structural parameter values clearly exclude any simple overlayer adsorption model on an Ag unreconstructed surface. A reconstructed surface model is proposed that is consistent with the NIXSW measurements and with previous scanning tunneling microscopy results. This comprises a near-hexagonal Ag surface layer with an Ag density of only 3/7 that of the underlying substrate layers; the methanethiolate molecules are adsorbed into 3-fold coordinated hollow sites on this open layer. The results are discussed in the context of the very limited published studies of longer alkyl chain thiolates on Ag(111).

引用

页码：2164 / 2170

页数：7

共 29 条

[1] BEAM LINE 4 - A DEDICATED SURFACE SCIENCE FACILITY AT DARESBURY-LABORATORY [J].