000204429 001__ 204429
000204429 005__ 20181203023727.0
000204429 0247_ $$2doi$$a10.1002/cphc.200301213
000204429 022__ $$a1439-4235
000204429 02470 $$2ISI$$a000222314300008
000204429 037__ $$aARTICLE
000204429 245__ $$aPrinciples of spin-echo modulation by J-couplings in magic-angle-spinning solid-state NMR
000204429 260__ $$bWILEY-V C H VERLAG GMBH$$c2004
000204429 269__ $$a2004
000204429 336__ $$aJournal Articles
000204429 520__ $$aIn 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.
000204429 6531_ $$aJ-coupling
000204429 6531_ $$amagic-angle spinning
000204429 6531_ $$aNMR spectroscopy
000204429 6531_ $$aspin echoes
000204429 700__ $$aDuma, L
000204429 700__ $$aLai, WC
000204429 700__ $$aCarravetta, M
000204429 700__ $$0248253$$aEmsley, L$$g251248
000204429 700__ $$aBrown, SP
000204429 700__ $$aLevitt, MH
000204429 773__ $$j5$$k6$$q815-833$$tCHEMPHYSCHEM
000204429 909C0 $$0252518$$pLRM$$xU12975
000204429 909CO $$ooai:infoscience.tind.io:204429$$pSB$$particle
000204429 937__ $$aEPFL-ARTICLE-204429
000204429 970__ $$aISI:000222314300008/LRM
000204429 973__ $$aOTHER$$rREVIEWED$$sPUBLISHED
000204429 980__ $$aARTICLE