Author
Listed:
- C.-H. NIEN
(Department of Physics and Astronomy, and Laboratory for Surface Modification, Rutgers, The State University of New Jersey, Piscataway, NJ 08854-8019, USA)
- I. M. ABDELREHIM
(Department of Physics and Astronomy, and Laboratory for Surface Modification, Rutgers, The State University of New Jersey, Piscataway, NJ 08854-8019, USA)
- T. E. MADEY
(Department of Physics and Astronomy, and Laboratory for Surface Modification, Rutgers, The State University of New Jersey, Piscataway, NJ 08854-8019, USA)
Abstract
The restructuring of S/W(111) surfaces has been studied using low-energy electron diffraction (LEED), Auger electron spectroscopy (AES) and scanning tunneling microscopy (STM). Dosing W(111) with a saturation coverage ofH2Sfollowed by annealing to>800K causes the substrate to reconstruct, forming a structure with(4× 4)periodicity. In addition, the terrace-step configurations restructure and form triangular domains with a preferential orientation. These domains coalesce and enlarge, and also form multiple steps when the surface is heated toT>1000K. The low reactivity of sulfided W(111) to high exposures of oxygen demonstrates that the surface is passivated by sulfur. Adsorption of S onto a faceted Pd/W(111) surface causes the facets to disappear, restoring the surface's planar form upon annealing. The resulting features are dominated by a(2× 2)structure. A size-mismatch mechanism, based on charge transfer between S/W and coadsorbed Pd/S on W, has been proposed to explain the formation of(4× 4)and(2× 2)structures, as well as the transition between these structures.
Suggested Citation
C.-H. Nien & I. M. Abdelrehim & T. E. Madey, 1999.
"Surface Restructuring Of W(111) Induced By Sulfur Overlayers,"
Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 6(01), pages 77-96.
Handle:
RePEc:wsi:srlxxx:v:06:y:1999:i:01:n:s0218625x9900010x
DOI: 10.1142/S0218625X9900010X
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