Surface structures of S on Pd(111)

S. Speller
T. Rauch
J. Bömermann
P. Borrmann   Phone: +49-(0)441-798-3362   Fax: +49-(0)441-798-3201
W. Heiland   Fax: +49-(0)541-969-2670

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