Study of synthetic diamonds by dynamic nuclear polarization-enhanced13C nuclear magnetic resonance spectroscopy |
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| Authors: | B Yang J Zhou H Hu L Li J Qiu J Guo P He J Lu C Ye |
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| Institution: | 1. Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics, The Chinese Academy of Sciences, 430071, Wuhan, People’s Republic of China
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| Abstract: | Four Ib-type synthetic diamond crystals were studied by dynamic nuclear polarization (DNP)-enhanced high resolution solid state13C nuclear magnetic resonance (NMR) spectroscopy. The home built DNP magic-angle-spinning (MAS) NMR spectrometer operates at a field strength of 1.9 T and the highest DNP enhancement factor of synthetic diamonds came near to 103. Comparing with Ib-type natural diamonds, the13C NMR linewidths of synthetic diamonds in static spectra are broader. The13C spin-lattice relaxation time and DNP polarization time of synthetic diamond are shorter than those of Ib-type natural diamond. From the hyperfine structure of the DNP enhancement curve, four kinds of nitrogen-centred free radicals could be identified in synthetic diamond. |
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