## Abstract

In dynamic-angle spinning (DAS), a sample spins around an axis inclined at an angle φ(t) with respect to the magnetic field such that the averages of P_{n}(cos φ) are zero. The simplest case is where φ(t) assumes two discrete values φ_{1} and φ_{2} (complementary DAS angles) such that the averages of P_{2}(cos φ) and P_{4}(cos φ) are zero, thereby removing second-order quadrupolar (and dipolar) broadening. Examples of DAS complementary angles are φ_{1} = 37.38° and φ_{2} = 79.19°. 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.

Original language | English (US) |
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Pages (from-to) | 470-487 |

Number of pages | 18 |

Journal | Journal of Magnetic Resonance (1969) |

Volume | 86 |

Issue number | 3 |

DOIs | |

State | Published - Feb 15 1990 |