the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Pseudo Rotary Resonance Relaxation Dispersion Effects in Isotropic Samples
Abstract. Enhanced transverse relaxation near rotary-resonance conditions is a well-documented effect for anisotropic solid samples undergoing magic-angle spinning (MAS). It is a surprising behavior for rotating liquids, in which first-order anisotropic interactions are averaged at a much faster timescale as compared with the spinning frequency. Here we report measurements of 13C transverse relaxation under spin lock for spinning samples of both polybutadiene rubber and polyethylene glycol solution. Maxima in the relaxation rates are observed when the spin-lock frequency matches one or two times the MAS rate. Through simulations, we qualitatively describe the appearance of this effect, which can be explained by time dependence caused by sample rotation and an inhomogeneous rf-field distribution. Consideration of this effect is important for MAS experiments based on rotary-resonance conditions, and motivates the design of new MAS coils with improved rf-field homogeneity.
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Status: open (until 17 Dec 2024)
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CC1: 'Comment on mr-2024-21', Tom Barbara, 21 Nov 2024
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The authors may find the paper by Kupce, Keifer and Delepierre of some interest: JMR 148,115-120 (2001). These reported on rotary resonance effects in MAS and TOCSY.
Citation: https://doi.org/10.5194/mr-2024-21-CC1 -
RC1: 'Comment on mr-2024-21', Anonymous Referee #1, 28 Nov 2024
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The comment was uploaded in the form of a supplement: https://mr.copernicus.org/preprints/mr-2024-21/mr-2024-21-RC1-supplement.pdf
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