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Default A unified heteronuclear decoupling strategy for magic-angle-spinning solid-state NMR spectroscopy.

A unified heteronuclear decoupling strategy for magic-angle-spinning solid-state NMR spectroscopy.

Related Articles A unified heteronuclear decoupling strategy for magic-angle-spinning solid-state NMR spectroscopy.

J Chem Phys. 2015 May 14;142(18):184201

Authors: Equbal A, Bjerring M, Madhu PK, Nielsen NC

Abstract
A unified strategy of two-pulse based heteronuclear decoupling for solid-state magic-angle spinning nuclear magnetic resonance is presented. The analysis presented here shows that different decoupling sequences like two-pulse phase-modulation (TPPM), X-inverse-X (XiX), and finite pulse refocused continuous wave (rCW(A)) are basically specific solutions of a more generalized decoupling scheme which incorporates the concept of time-modulation along with phase-modulation. A plethora of other good decoupling conditions apart from the standard, TPPM, XiX, and rCW(A) decoupling conditions are available from the unified decoupling approach. The importance of combined time- and phase-modulation in order to achieve the best decoupling conditions is delineated. The consequences of different indirect dipolar interactions arising from cross terms comprising of heteronuclear and homonuclear dipolar coupling terms and also those between heteronuclear dipolar coupling and chemical-shift anisotropy terms are presented in order to unfold the effects of anisotropic interactions under different decoupling conditions. Extensive numerical simulation results are corroborated with experiments on standard amino acids.


PMID: 25978884 [PubMed - as supplied by publisher]



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