The structure of evaporated carbon films has been studied by electron diffraction using a camera with a rotating sector. Films of 100 A thickness were used. Eleven halos were observed in the range of s = (4~/)l) sin 0 < 33 A -1. Both the radial distribution and the correlation methods were applied to the analysis of data.Results obtained are as follows. Two kinds of bond distances exist in the film. One is the graphitelike 1.41 A, and the other is the diamond-like 1-55 A. The number of the diamond-like distances is somewhat larger than that of the graphite-like distances. Mean deviations of these equilibrium distances are 0.11 N 0.12 A, which are about twice as large as those found in free molecules. The atomic distribution around any atom becomes uniform beyond several Angstr6m units. The probable atomic arrangement in the film is a three-dimensional random network consisting of graphite-like and diamond-like configurations. A model of such atomic arrangement is proposed and compared with structures of other amorphous carbons.
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