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Author Chin, R. P. ♦ Huang, J. Y. ♦ Shen, Y. R. ♦ Chuang, T. J. ♦ Seki, H.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ METHYL RADICALS ♦ ADSORPTION ♦ HYDROGEN ♦ CARBON ♦ MONOCRYSTALS ♦ DIAMONDS ♦ STABILIZATION ♦ INFRARED SPECTRA ♦ SURFACE STRUCTURE
Abstract Methyl-radical and atomic hydrogen adsorption on C(111) have been studied by infrared-visible sum-frequency vibrational spectroscopy. Methyl iodide, di-tert-butyl-peroxide, and methane passing through a hot filament are used to produce methyl radicals (CH{sub 3}). Low-energy CH{sub 3} from pyrolytic dissociation at {approximately}800{degree}C adsorb intact on the surface, but with surface annealing above 350{degree}C, convert to tetrahedrally bonded CH. High-energy CH{sub 3} produced at {approximately}1800{degree}C convert readily to CH upon adsorption. Co-dosing a high-temperature ({approximately}800{degree}C) C(111) substrate with hydrogen and methane via a hot filament at {approximately}1800{degree}C yields only the stable tetrahedrally-bonded CH-species on the surface. They appear to stabilize the diamond surface structure. The coverage is not full, leaving sites open for CH{sub 3} to adsorb and convert to CH as is necessary for chemical vapor deposition diamond growth. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-09-01
Publisher Department Lawrence Berkeley National Laboratory
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 54
Issue Number 11
Organization Lawrence Berkeley National Laboratory


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