Abstract
The disordered tetrahedral carbon films have been grown by ion beam deposition at ∼120 eV. An absorption maximum 6.15-5.80 eV (E B0 ) and a threshold 4.8-4.5 eV were resolved and tentatively attributed to Γ +5 - Γ -5 and Γ +5 - K2 transitions in lonsdaleite. The cubic sp3-carbon manifested as maxima at 5.45-5.50 eV (Γ′25 - Δx) and 7.0 eV (Γ′25 - Γ15). Urbach tails of different steepness were resolved. A 6.508 eV maximum of 0.52 eV half-width at 90K was resolved. The spectroscopic data on absorpsion and luminescence of sp3-bonded carbon films of different allotropies are discussed.
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Maschenko, V.E., Puzikov, V.M., Semenov, A.V. (1995). Extended and Localized Electronic States in Tetrahedral Carbon Films. In: Prelas, M.A., Gielisse, P., Popovici, G., Spitsyn, B.V., Stacy, T. (eds) Wide Band Gap Electronic Materials. NATO ASI Series, vol 1. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-0173-8_28
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