Articles | Volume 2, issue 1
https://doi.org/10.5194/mr-2-499-2021
https://doi.org/10.5194/mr-2-499-2021
Research article
 | 
01 Jul 2021
Research article |  | 01 Jul 2021

Residual dipolar line width in magic-angle spinning proton solid-state NMR

Matías Chávez, Thomas Wiegand, Alexander A. Malär, Beat H. Meier, and Matthias Ernst

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Cited articles

Agarwal, V., Penzel, S., Székely, K., Cadalbert, R., Testori, E., Oss, A., Past, J., Samoson, A., Ernst, M., Böckmann, A., and Meier, B. H.: De Novo 3D Structure Determination from Sub-milligram Protein Samples by Solid-State 100 kHz MAS NMR Spectroscopy, Angew. Chem. Int. Ed. Engl., 53, 12253–12256, 2014. a
Andrew, E. R. and Farnell, L. F.: The effect of macroscopic rotation on anistotropic bilinear spin interactions in solids, Mol. Phys., 15, 157–165, 1968. a
Andrew, E. R., Bradbury, A., and Eades, R. G.: Nuclear Magnetic Resonance Spectra From a Crystal Rotated at High Speed, Nature, 182, 1659–1659, 1958. a
Andrew, E. R., Bradbury, A., and Eades, R. G.: Removal of Dipolar Broadening of Nuclear Magnetic Resonance Spectra of Solids by Specimen Rotation, Nature, 183, 1802–1803, 1959. a
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Short summary
Sample rotation around the magic angle averages out the dipolar couplings in homonuclear spin systems in a first-order approximation. However, in higher orders, residual coupling terms remain and lead to a broadening of the spectral lines. We investigate the source of this broadening and the effects on the powder line shape in small spin systems with and without chemical shifts. We show that one can expect different scaling behavior as a function of the spinning frequency for the two cases.