Interaction of atomic hydrogen with the diamond C(111) surface studied by infrared-visible sum-frequency-generation spectroscopy
- Department of Physics, University of California, Berkeley, California 94720 (United States)
- Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei (Taiwan)
- IBM Almaden Research Center, 650 Harry Road, San Jose, California 95120-6099 (United States)
Atomic hydrogen (deuterium) adsorbed onto the diamond C(111) surface has been studied by infrared-visible sum-frequency-generation spectroscopy. Monohydride termination of H/C(111) is confirmed by the observation of sharp CH stretch (2838 cm{sup {minus}1}) and CH bend (1331 cm{sup {minus}1}) modes in the spectrum. Deuterium on the surface gives a CD stretch frequency of 2115 cm{sup {minus}1}. The rate of hydrogen adsorption is measured in comparison with the rate of deuterium abstraction by hydrogen. Measurement of thermal desorption of hydrogen from C(111) suggests a near first-order desorption kinetics with an activation energy of 4.0{plus_minus}0.4 eV and a preexponential factor of 10{sup 15{plus_minus}2} s{sup {minus}1}. On the bare reconstructed C(111) surface, distinct CC surface phonon features characteristic of the (2{times}1)-reconstructed surface are seen, which seem to support the modified Pandey model of Bechstedt and Reichardt.
- Research Organization:
- Lawrence Berkeley National Laboratory
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 112945
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 8 Vol. 52; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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