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

V.R. Dhanak, A.G. Shard, B.C.C. Cowie, A. Santoni

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Abstract

The surface structures of (√3 x √3)R30°-S and (√7 x √7)R19.1°-S on Pd(111) 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 (√3 x √3)R30° 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 fcc (111) transition metal surfaces. SEXAFS analysis revealed a S-Pd nearest neighbour bond distance of 2.28±0.04 Å. The results for the (√7 x √7)R19.1° 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. © 1998 Elsevier Science B.V. All rights reserved.
Original languageEnglish
Pages (from-to)321 - 329
Number of pages9
JournalSurface Science
Volume410
Issue number2-3
DOIs
Publication statusPublished - 1 Aug 1998
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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