Articles | Volume 6, issue 1
https://doi.org/10.5194/mr-6-119-2025
https://doi.org/10.5194/mr-6-119-2025
Research article
 | 
03 Jun 2025
Research article |  | 03 Jun 2025

Pseudo rotary resonance relaxation dispersion effects in isotropic samples

Evgeny Nimerovsky, Jonas Mehrens, and Loren B. Andreas

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Cited articles

Abyzov, A., Blackledge, M., and Zweckstetter, M.: Conformational Dynamics of Intrinsically Disordered Proteins Regulate Biomolecular Condensate Chemistry, Chem. Rev., 122, 6719–6748, https://doi.org/10.1021/acs.chemrev.1c00774, 2022. 
Aebischer, K., Tošner, Z., and Ernst, M.: Effects of radial radio-frequency field inhomogeneity on MAS solid-state NMR experiments, Magn. Reson., 2, 523–543, https://doi.org/10.5194/mr-2-523-2021, 2021. 
Alam, M. K., Bhuvaneshwari, R. A., and Sengupta, I.: 19F NMR relaxation of buried tryptophan side chains suggest anisotropic rotational diffusion of the protein RfaH, J. Biomol. NMR, 78, 265–273, https://doi.org/10.1007/s10858-024-00450-x, 2024. 
Andrew, E. R., Bradbury, A., and Eades, R. G.: Nuclear Magnetic Resonance Spectra from a Crystal rotated at High Speed, Nature, 182, 1659–1659, https://doi.org/10.1038/1821659a0, 1958. 
Blahut, J., Brandl, M. J., Pradhan, T., Reif, B., and Tošner, Z.: Sensitivity-Enhanced Multidimensional Solid-State NMR Spectroscopy by Optimal-Control-Based Transverse Mixing Sequences, J. Am. Chem. Soc., 144, 17336–17340, https://doi.org/10.1021/jacs.2c06568, 2022. 
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Short summary
Local dynamics in rotating solids can be investigated by measuring enhanced transverse relaxation rates near rotary resonance conditions. In contrast, this effect is not expected in rotating solutions, as first-order anisotropic interactions are averaged out. For rotating solutions, we show how a decrease in the spin-lock signal near rotary resonance reports fluctuations that are introduced due to imperfect hardware, with rf-field imperfections being the primary source of the effect.
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