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


Adsorption and subsequent surface processes of hydrogen and hydrocarbon species on the diamond C(111)-(2xF) 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 H 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 are two stages of saturation for 17 adsorption on the C(111)-(2xF) 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)-(1x1) surface with over half a monolayer of II adsorption behaves quite differently with respect to F adsorption.

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We express our thanks to Dr. J. Huang, R. Chin and Professor Y.R. Shen of Department of Physics, University of California, Berkeley, for their collaboration and many useful discussions.

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Yamada, T., Chuang, T. & Seki, H. Chemical and Structural Effects on Diamond C(111)-(2×1) Surface Exposed to F, H and Hydrocarbon Species. MRS Online Proceedings Library 270, 383–388 (1992).

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