Principles of spin-echo modulation by J-couplings in magic-angle-spinning solid-state NMR
UNSPECIFIED (2004) Principles of spin-echo modulation by J-couplings in magic-angle-spinning solid-state NMR. CHEMPHYSCHEM, 5 (6). pp. 815-833. ISSN 1439-4235Full text not available from this repository.
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|
|Official Date:||21 June 2004|
|Number of Pages:||19|
|Page Range:||pp. 815-833|
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