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APS » Journals » Phys. Rev. Lett. » Volume 76 » Issue 26
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Phys. Rev. Lett. 76, 4923–4926 (1996)

Theoretical and Experimental Optical Spectroscopy Study of Hydrogen Adsorption at Si(111)-( 7×7)

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C. Noguez1, C. Beitia2, W. Preyss2, A. I. Shkrebtii3, M. Roy2, Y. Borensztein2, and R. Del Sole3
1Instituto de Fisíca, Universidad Nacional Autónoma de México, Apdo. Postal 20-364, 01000 México D.F., México and Department of Physics and Astronomy, and CMSS Program, Ohio University, Athens, Ohio 45701-2979
2Laboratoire d'Optique des Solides, UA CNRS 781, Université Pierre et Marie Curie, Case 80, 4 place Jussieu, 75252 Paris Cedex 05, France
3Instituto Nazionale di Fisica della Materia, Departimento di Fisica, II Universitá di Roma “Tor Vergata,” Via della Ricerca Scientifica 1, 00133 Rome, Italy

Received 2 November 1995; revised 14 March 1996; published in the issue dated 24 June 1996

The combination of in situ real-time surface differential reflectivity (SDR) spectroscopy and microscopic calculations has been used for the first time to investigate gas adsorption on a Si surface. The optical signatures of some microscopic structural units of Si(111)-( 7×7) have been identified. The development of the corresponding features in the SDR spectra upon the amount of H exposure allowed us to demonstrate the occurrence of two different mechanisms in the hydrogenation and to determine their relative kinetics.

© 1996 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.4923
DOI:
10.1103/PhysRevLett.76.4923
PACS:
68.35.Bs, 68.45.Da, 73.20.At, 78.66.Db
 
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