Pseudo rotary resonance relaxation dispersion effects in isotropic samples
<p>Enhanced transverse relaxation near rotary resonance conditions is a well-documented effect for anisotropic solid samples undergoing magic-angle spinning (MAS). We report transverse signal decay associated with rotary resonance conditions for rotating liquids, a surprising observation, sinc...
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Copernicus Publications
2025-06-01
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| Series: | Magnetic Resonance |
| Online Access: | https://mr.copernicus.org/articles/6/119/2025/mr-6-119-2025.pdf |
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| author | E. Nimerovsky J. Mehrens L. B. Andreas |
| author_facet | E. Nimerovsky J. Mehrens L. B. Andreas |
| author_sort | E. Nimerovsky |
| collection | DOAJ |
| description | <p>Enhanced transverse relaxation near rotary resonance conditions is a well-documented effect for anisotropic solid samples undergoing magic-angle spinning (MAS). We report transverse signal decay associated with rotary resonance conditions for rotating liquids, a surprising observation, since first-order anisotropic interactions are averaged at a much faster timescale compared with the spinning frequency. We report measurements of <span class="inline-formula"><sup>13</sup>C</span> and <span class="inline-formula"><sup>1</sup>H</span> signal intensities under spin lock for spinning samples of polybutadiene rubber, polyethylene glycol solution, and 99.96 % <span class="inline-formula">D<sub>2</sub>O</span>. A drastic reduction in spin-lock signal intensities is observed when the spin-lock frequency matches 1 or 2 times the MAS rate. In addition, oscillations of the signal are observed, consistent with a coherent origin of the effect, a pseudo rotary resonance relaxation dispersion (pseudo-RRD). Through simulations, we qualitatively describe the appearance of pseudo-RRD, which can be explained by time dependence caused by sample rotation and an inhomogeneous field, the origin of which is an instrumental imperfection. Consideration of this effect is important for MAS experiments based on rotary resonance conditions and motivates the design of new MAS coils with improved radio frequency (RF)-field homogeneity.</p> |
| format | Article |
| id | doaj-art-b038b0dd05de453e8c3ca47af658654b |
| institution | OA Journals |
| issn | 2699-0016 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Copernicus Publications |
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| series | Magnetic Resonance |
| spelling | doaj-art-b038b0dd05de453e8c3ca47af658654b2025-08-20T02:32:19ZengCopernicus PublicationsMagnetic Resonance2699-00162025-06-01611912910.5194/mr-6-119-2025Pseudo rotary resonance relaxation dispersion effects in isotropic samplesE. Nimerovsky0J. Mehrens1L. B. Andreas2Department of NMR-based Structural Biology, Max Planck Institute for Multidisciplinary Sciences, Am Faßberg 11, Göttingen, GermanyDepartment of NMR-based Structural Biology, Max Planck Institute for Multidisciplinary Sciences, Am Faßberg 11, Göttingen, GermanyDepartment of NMR-based Structural Biology, Max Planck Institute for Multidisciplinary Sciences, Am Faßberg 11, Göttingen, Germany<p>Enhanced transverse relaxation near rotary resonance conditions is a well-documented effect for anisotropic solid samples undergoing magic-angle spinning (MAS). We report transverse signal decay associated with rotary resonance conditions for rotating liquids, a surprising observation, since first-order anisotropic interactions are averaged at a much faster timescale compared with the spinning frequency. We report measurements of <span class="inline-formula"><sup>13</sup>C</span> and <span class="inline-formula"><sup>1</sup>H</span> signal intensities under spin lock for spinning samples of polybutadiene rubber, polyethylene glycol solution, and 99.96 % <span class="inline-formula">D<sub>2</sub>O</span>. A drastic reduction in spin-lock signal intensities is observed when the spin-lock frequency matches 1 or 2 times the MAS rate. In addition, oscillations of the signal are observed, consistent with a coherent origin of the effect, a pseudo rotary resonance relaxation dispersion (pseudo-RRD). Through simulations, we qualitatively describe the appearance of pseudo-RRD, which can be explained by time dependence caused by sample rotation and an inhomogeneous field, the origin of which is an instrumental imperfection. Consideration of this effect is important for MAS experiments based on rotary resonance conditions and motivates the design of new MAS coils with improved radio frequency (RF)-field homogeneity.</p>https://mr.copernicus.org/articles/6/119/2025/mr-6-119-2025.pdf |
| spellingShingle | E. Nimerovsky J. Mehrens L. B. Andreas Pseudo rotary resonance relaxation dispersion effects in isotropic samples Magnetic Resonance |
| title | Pseudo rotary resonance relaxation dispersion effects in isotropic samples |
| title_full | Pseudo rotary resonance relaxation dispersion effects in isotropic samples |
| title_fullStr | Pseudo rotary resonance relaxation dispersion effects in isotropic samples |
| title_full_unstemmed | Pseudo rotary resonance relaxation dispersion effects in isotropic samples |
| title_short | Pseudo rotary resonance relaxation dispersion effects in isotropic samples |
| title_sort | pseudo rotary resonance relaxation dispersion effects in isotropic samples |
| url | https://mr.copernicus.org/articles/6/119/2025/mr-6-119-2025.pdf |
| work_keys_str_mv | AT enimerovsky pseudorotaryresonancerelaxationdispersioneffectsinisotropicsamples AT jmehrens pseudorotaryresonancerelaxationdispersioneffectsinisotropicsamples AT lbandreas pseudorotaryresonancerelaxationdispersioneffectsinisotropicsamples |