Abstract
Three chemical vapor deposited diamond films were studied by dynamic nuclear polarization (DNP)-enhanced high-resolution solid-state C-13 nuclear magnetic resonance (NMR) spectroscopy. Enhanced C-13 direct-poiarization spectra of diamond Films were obtained by irradiating the samples with microwaves at or near electron spin resonance Larmor frequency of carbon center free radicals. No NMR signal for sp(2) hybridized carbons could be observed. From the Curve of the DNP enhancement as a function of Frequency, it is found that the dominant DNP mechanism is the solid-state effect. The C-13 cross-polarization spectrum, which is an evidence for existence of the proton defect in the lattice of diamond films, is much broader than the C-13 single Pulse spectrum. The reason is discussed shortly.
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