The concentration of sp2 and sp3 carbon atoms in an amorphous carbon film has been determined directly from 13C n.m.r. spectroscopy, which also shows that the majority of the hydrogen atoms are attached to sp3 carbon atoms.
R. H. Jarman and G. J. Ray, J. Chem. Soc., Chem. Commun., 1985, 1153 DOI: 10.1039/C39850001153
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