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Chemical and Structural Effects on Diamond C(111)-(2×1) Surface Exposed to F, H and Hydrocarbon Species

Published online by Cambridge University Press:  25 February 2011

Taro Yramada ,
T.J. Chuang  and
H. Seki
Taro Yramada
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120–6099
T.J. Chuang
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120–6099
H. Seki
Affiliation:
IBM Research Division, Almaden Research Center, 650 Harry Road, San Jose, California 95120–6099
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Abstract

Adsorption and subsequent surface processes of hydrogen and hydrocarbon species on the diamond C(111)-(2×1) bare surface have been investigated by AES, XPS, LEED, TDS and laser non-linear spectroscopies (SHG and SFG) under ultrahigh vacuum condition. Extremely low coverage of atomic II causes the transition of the hare (2×1) surface to the (1×1) structure. Exposure of the. bare (2×1) surface to CIIx species from hot filament activated methane leads to the formation mainly of CH3 species. The conversion of the surface structure from (2×1) to (1×1) with exposure does take place but not as easily as for hydrogen. These studies are now being extended to adsorption of F by exposures to XeF2 There arc two stages of saturation for 17 adsorption on the C(111)-(2×1) surface. This is interpreted to indicate that there are at least two adsorption sites for the F atoms. Whereas adsorption of II atoms at coverages less than 5% of a monolayer causes the surface lattice transition from (2×1) to (1×1) structure, the (2×1) structure is retained at all levels of fluorine adsorption. However the C(111) (1×1) surface with over half a monolayer of II adsorption behaves quite differently with respect to F adsorption.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 270: Symposium M – Novel Forms of Carbon , 1992 , 383
Copyright
Copyright © Materials Research Society 1992

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References

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