Dynamic-angle spinning of quadrupolar nuclei

In dynamic-angle spinning (DAS), a sample spins around an axis inclined at an angle θ ( t ) with respect to the magnetic field such that the averages of P n ( cos θ ) are zero. The simplest case is where θ ( t ) assumes two discrete values θ 1 and θ 2 (complementary DAS angles) such that the average...

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Bibliographic Details
Published in:Journal of magnetic resonance (1997) 2011-12, Vol.213 (2), p.298-315
Main Authors: Mueller, K.T., Sun, B.Q., Chingas, G.C., Zwanziger, J.W., Terao, T., Pines, A.
Format: Article
Language:English
Subjects:
Magnetic fields
Magnetic resonance
Nuclear magnetic resonance
Nuclei
Spinning
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Summary:In dynamic-angle spinning (DAS), a sample spins around an axis inclined at an angle θ ( t ) with respect to the magnetic field such that the averages of P n ( cos θ ) are zero. The simplest case is where θ ( t ) assumes two discrete values θ 1 and θ 2 (complementary DAS angles) such that the averages of P 2 ( cos θ ) and P 4 ( cos θ ) are zero, thereby removing second-order quadrupolar (and dipolar) broadening. Examples of DAS complementary angles are θ 1 = 37.38 ° and θ 2 = 79.18 ° . Experimental details for DAS experiments are provided and applications to sodium-23 and oxygen-17 NMR illustrate the enhanced resolution achieved by removing the second-order broadening inherent in magic-angle spinning.
ISSN:1090-7807
1096-0856
DOI:10.1016/j.jmr.2011.08.034