The structures of sulphur on Pd(111) studied by X-ray standing wavefield absorption and surface EXAFS

被引：36

作者：

Dhanak, VR ^{[1
]}

Shard, AG

Cowie, BCC

Santoni, A

机构：

[1] Univ Liverpool, IRC Surface Sci, Liverpool L69 3BX, Merseyside, England

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

[3] ENEA, INN, Div Nuovi Mat, I-00100 Rome, Italy

来源：

SURFACE SCIENCE | 1998年 / 410卷 / 2-3期

基金：

英国工程与自然科学研究理事会;

关键词：

chemisorption; low index single crystal surfaces; normal incidence standing X-ray wavefield (NIXSW); palladium; sulphur; surface extended X-ray absorption fine structure (SEXAFS); surface relaxation and reconstruction; surface structure; X-ray absorption;

D O I：

10.1016/S0039-6028(98)00332-X

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 surface structures of (root 3 x root 3)R30 degrees-S and (root 7 x root 7)R19.1 degrees-S on Pd(lll) have been investigated by normal incidence X-ray standing wave (NIXSW) absorption and surface extended X-ray absorption fine structure (SEXAFS). NIXSW measurements show that the most likely site of S adsorption in the (root 3 x root 3)R30 degrees phase is the threefold "fcc" hollow. The location of the S atoms at the "fcc" hollow site is consistent with S adsorption on the neighbouring fee (111) transition metal surfaces. SEXAFS analysis revealed a S-Pd nearest neighbour bond distance of 2.28+/-0.04 Angstrom. The results for the (root 7 x root 7)R19.1 degrees phase suggest that the structure involves a mixed S-Pd overlayer, with the S-Pd vertical layer spacing equal to the Pd bulk (111) spacing. (C) 1998 Elsevier Science B.V. All rights reserved.

引用

页码：321 / 329

页数：9

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