Dürr M, Höfer U. Stereochemistry on Si(001): angular dependence of H2 dissociation.
PHYSICAL REVIEW LETTERS 2002;
88:076107. [PMID:
11863921 DOI:
10.1103/physrevlett.88.076107]
[Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2001] [Indexed: 05/23/2023]
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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