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.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry
Dhanak, V. R., Shard, A. G., Cowie, B. C. C., & Santoni, A. (1998). The structures of sulphur on Pd(111) studied by X-ray standing wavefield absorption and surface EXAFS. Surface Science, 410(2-3), 321 - 329. https://doi.org/10.1016/S0039-6028(98)00332-X