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Principles of spin-echo modulation by J-couplings in magic-angle-spinning solid-state NMR
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UNSPECIFIED (2004) Principles of spin-echo modulation by J-couplings in magic-angle-spinning solid-state NMR. [Journal Item]
Full text not available from this repository.Abstract
In magic angle spinning solid-state NMR, the homonuclear J-couplings between pairs of spin-1/2 nuclei may be determined by studying the modulation of the spin echo induced by a pi-pulse, as a function of the echo duration. We present the theory of J-induced spin-echo modulation in magic-angle-spinning solids, and derive a set of modulation regimes which apply under different experimental conditions. In most cases, the dominant spin-echo modulation frequency is exactly equal to the J-coupling. Some what surprisingly, the chemical shift anisotropies and dipole-dipole couplings tend to stabilise-rather than obscure-the J-modulation. The theoretical conclusions are supported by numerical simulations and experimental results obtained for three representative samples containing C-13 spin pairs.
| Item Type: | Journal Item |
|---|---|
| Subjects: | Q Science > QD Chemistry Q Science > QC Physics |
| Journal or Publication Title: | CHEMPHYSCHEM |
| Publisher: | WILEY-V C H VERLAG GMBH |
| ISSN: | 1439-4235 |
| Date: | 21 June 2004 |
| Volume: | 5 |
| Number: | 6 |
| Number of Pages: | 19 |
| Page Range: | pp. 815-833 |
| Publication Status: | Published |
| URI: | http://wrap.warwick.ac.uk/id/eprint/8308 |
Data sourced from Thomson Reuters' Web of Knowledge
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