Abstract
The high resolution electron energy loss spectrum of polycrystalline diamond films deposited from various isotopic gas mixtures, C12H4+H2, C12D4+D2, and C13H4+H2, are reported. Three types of peaks were unambiguously identified: (1) Pure C–C related peaks (a diamond C–C stretch at ∼150meV and its overtones at 300, 450, and 600meV), (2) pure C–H related peaks (C–H bend at ∼150meV and C–H stretch of sp3 carbon at 360meV), and (3) coupling of C–H and C–C peaks (∼510meV peak due to coupling of the C–H stretch at 360meV with either the C–C stretch or the C–H bend at ∼150–155meV).
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