Applications of the {sup 13}C NMR magic angle turning experiment to coal studies
- Univ. of Utah, Salt Lake City, UT (United States); and others
The magic-angle-turning (MAT) technique employs slow (ca 30 Hz) rotation of a powdered sample at the magic angle, in concert with pulses synchronized to 1/3 of the rotor period, to obtain isotropic-shift information in one dimension of a 2D spectrum. The other dimension displays a slow-spinning-sideband powder pattern which, at the low rotor frequencies employed, resembles a stationary-sample powder pattern. The MAT experiment enables one to determine the chemical-shift principal values in compounds where spectral overlap precludes the use of 1D methods. By introducing the chemical shift anisotropy into the experiment, the structural information which is hidden in the standard {sup 13}C CP/MAS spectra due to the severe overlap of the resonance lines can now be extracted.
- OSTI ID:
- 214680
- Report Number(s):
- CONF-950801--
- Country of Publication:
- United States
- Language:
- English
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