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Stereochemistry on Si(001): Angular dependence of H2 dissociation

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons60469

Dürr,  Michael
Laser Chemistry, Max Planck Institute of Quantum Optics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons60567

Höfer,  Ulrich
Laser Chemistry, Max Planck Institute of Quantum Optics, Max Planck Society;

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Dürr, M., & Höfer, U. (2002). Stereochemistry on Si(001): Angular dependence of H2 dissociation. Physical Review Letters, 88(7): 076107. 076107. Retrieved from http://link.aps.org/abstract/PRL/v88/e076107.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-C24F-E
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 cos3ϑ and cos12ϑ parallel and perpendicular to the dimer, respectively. The DB-steps show enhanced reactivity under glancing incidence in the upwards direction. The results are traced back to the directionality of the covalent surface bonds.