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Stereochemistry on Si(001): angular dependence of H2 dissociation.

Authors
  • Dürr, Michael
  • Höfer, Ulrich
Type
Published Article
Journal
Physical review letters
Publication Date
Feb 18, 2002
Volume
88
Issue
7
Pages
76107–76107
Identifiers
PMID: 11863921
Source
Medline
License
Unknown

Abstract

The angular dependence of the dissociative adsorption of molecular hydrogen at terrace and step sites of vicinal single-domain Si(001) surfaces was investigated by means of molecular beam techniques and optical second-harmonic generation. A strongly anisotropic behavior was observed for terrace adsorption with polar distributions of cos3theta and cos12theta parallel and perpendicular to the dimer, respectively. The D(B)-steps show enhanced reactivity under glancing incidence in the upwards direction. The results are traced back to the directionality of the covalent surface bonds.

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