Distortion-free {sup 13}C NMR spectroscopy in coal: {sup 1}H rotating-frame dynamic nuclear polarization and {sup 1}H-{sup 13}C cross-polarization
- Colorado State Univ., Fort Collins, CO (United States)
A {sup 1}H-{sup 13}C cross-polarization (CP) experiment is described in which the {sup 1}H magnetization, used in CP, is obtained via dynamic nuclear polarization (DNP) in the proton rotating frame (RF DNP). This experiment can be carried out in coal and other solids containing unpaired electrons. In this so-called RF DNP-CP experiment, interplay effects between the {sup 1}H-{sup 13}C polarization-transfer times and the {sup 1}H rotating-frame relaxation time are avoided; thus {sup 13}C spectral distortions due to these effects are prevented. Moreover, multiple-contact RF DNP-CP experiments are possible, and these experiments reduce the measuring time of a {sup 13}C spectrum. An application of the RF DNP-CP technique in a low-volatile bituminous coal is given. 25 refs., 3 figs.
- OSTI ID:
- 441405
- Report Number(s):
- CONF-891206-; TRN: 93:001852-0010
- Resource Relation:
- Conference: PACIFICHEM `89: international chemical congress of Pacific Basin Societies, Honolulu, HI (United States), 17-22 Dec 1989; Other Information: PBD: 1993; Related Information: Is Part Of Magnetic resonance of carbonaceous solids; Botto, R.E.; Sanada, Y. [eds.]; PB: 624 p.
- Country of Publication:
- United States
- Language:
- English
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