Articles | Volume 2, issue 1
https://doi.org/10.5194/mr-2-343-2021
https://doi.org/10.5194/mr-2-343-2021
Research article
 | 
28 May 2021
Research article |  | 28 May 2021

Heteronuclear and homonuclear radio-frequency-driven recoupling

Evgeny Nimerovsky, Kai Xue, Kumar Tekwani Movellan, and Loren B. Andreas

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Cited articles

Andreas, L. B., Le Marchand, T., Jaudzems, K., and Pintacuda, G.: High-resolution proton-detected NMR of proteins at very fast MAS, J. Magn. Reson., 253, 36–49, https://doi.org/10.1016/j.jmr.2015.01.003, 2015. 
Aucoin, D., Camenares, D., Zhao, X., Jung, J., Sato, T., and Smith, S. O.: High resolution 1H MAS RFDR NMR of biological membranes, J. Magn. Reson., 197, 77–86, https://doi.org/10.1016/j.jmr.2008.12.009, 2009. 
Bak, M., Rasmussen, J. T., and Nielsen, N. C.: SIMPSON: A General Simulation Program for Solid-State NMR Spectroscopy, J. Magn. Reson., 147, 296–330, https://doi.org/10.1006/jmre.2000.2179, 2000. 
Bennett, A. E., Griffin, R. G., Ok, J. H., and Vega, S.: Chemical shift correlation spectroscopy in rotating solids: Radio frequency-driven dipolar recoupling and longitudinal exchange, J. Chem. Phys., 96, 8624–8627, https://doi.org/10.1063/1.462267, 1992. 
Bennett, A. E., Rienstra, C. M., Griffiths, J. M., Zhen, W., Lansbury, P. T., and Griffin, R. G.: Homonuclear radio frequency-driven recoupling in rotating solids, J. Chem. Phys., 108, 9463–9479, https://doi.org/10.1063/1.476420, 1998. 
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Short summary
The RFDR sequence has been widely used for homonuclear recoupling. The paper describes a heteronuclear version of RFDR. HET-RFDR sequence transfers longitudinal polarization between heteronuclear pairs by applying RFDR on two channels simultaneously. We perform an operator analysis of HET-RFDR and RFDR. Such an analysis allows for better understanding of the influence of offsets and paths of magnetization transfers for both these experiments, as well as the crucial role of XY phase cycling.