Relative merits of rCW(A) and XiX heteronuclear spin decoupling in solid-state magic-angle-spinning NMR spectroscopy: A bimodal Floquet analysis

Journal of Magnetic Resonance
Asif EqubalShimon Vega

Abstract

We present a bimodal Floquet analysis of the recently introduced refocused continuous wave (rCW) solid-state NMR heteronuclear dipolar decoupling method and compare it with the similar looking X-inverse X (XiX) scheme. The description is formulated in the rf interaction frame and is valid for both finite and ideal π pulse rCW irradiation that forms the refocusing element in the rCW scheme. The effective heteronuclear dipolar coupling Hamiltonian up to first order is described. The analysis delineates the difference between the two sequences to different orders of their Hamiltonians for both diagonal and off-diagonal parts. All the resonance conditions observed in experiments and simulations have been characterised and their influence on residual line broadening is highlighted. The theoretical comparison substantiates the numerical simulations and experimental results to a large extent.

References

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Oct 6, 2010·Progress in Nuclear Magnetic Resonance Spectroscopy·Michal LeskesShimon Vega
Dec 12, 2012·Journal of Magnetic Resonance·Joachim M VintherNiels Chr Nielsen
Dec 13, 2012·The Journal of Chemical Physics·Joachim M VintherNiels Chr Nielsen
Aug 6, 2014·Journal of Magnetic Resonance·Zdeněk TošnerThomas Vosegaard
Aug 16, 2014·Journal of Magnetic Resonance·Asif EqubalNiels Chr Nielsen
May 17, 2015·The Journal of Chemical Physics·Asif EqubalNiels Chr Nielsen

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Citations

Aug 16, 2014·Journal of Magnetic Resonance·Asif EqubalNiels Chr Nielsen
Mar 28, 2006·Journal of Magnetic Resonance·Luís MafraFilipe A Almeida Paz
Jan 24, 2017·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Ilya FrantsuzovPaul Hodgkinson
Nov 3, 2016·Physical Chemistry Chemical Physics : PCCP·Asif EqubalNiels Chr Nielsen
Mar 3, 2017·The Journal of Chemical Physics·Asif EqubalVipin Agarwal

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