Study of synthetic diamonds by dynamic nuclear polarization-enhanced13C nuclear magnetic resonance spectroscopy
1995
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.
Keywords:
- Solid-state nuclear magnetic resonance
- Analytical chemistry
- Relaxometry
- Nuclear magnetic resonance
- Free induction decay
- Nuclear magnetic resonance crystallography
- Two-dimensional nuclear magnetic resonance spectroscopy
- Nuclear Overhauser effect
- Nuclear magnetic resonance decoupling
- Spin echo
- Chemistry
- Fluorine-19 NMR
- Diamond
- Nuclear magnetic resonance spectroscopy
- Synthetic diamond
- Correction
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