Surface structures of S on Pd(111)
- S. Speller
- T. Rauch
- J. Bömermann
- P. Borrmann
- W. Heiland
- Surface Science 441 (1999) 107-116
- for local use only
- Date: 19990526
- Article: published in Surface Science 441 (1999) 107-116
- Low energy electron diffraction (LEED); Chemisorption; Palladium;Scanning tunneling microscopy; Sulfur; Surface segregation; Surface structure, morphology, roughness, and topography; X-ray photoelectron spetroscopy
- S is adsorbed on Pd(111) from the gas phase using H2S as 'carrier' gas.
After adsorption at room temperature a (sqpr(3)*sqrt(3))R30° LEED pattern is observed.
Using STM coexisting (sqrt(3)*sqrt(3))R30°, (sqrt(7)*sqrt(7))R19.1° (2*2) stripes,
(2*2) triangles and disordered S structures are found.
Annealing favors the formation of (sqrt(7)*sqrt(7))R19.1° areas on
the surface. The structure, produced by H2S adsorption are compared
with S structures produced by segregation. A detailed model
for the (sqrt(7)*sqrt(7))R19.1° is developed on the basis of AES and XPS data and FLAPW calculations.
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Upload by Thomas Severiens on 16 November 1999