magic angle spinning 

Initialism: MAS
https://doi.org/10.1351/goldbook.08377
Technique in solid-state nuclear magnetic resonance spectroscopy to remove or reduce the influence of anisotropic interactions by rapid sample rotation about the magic angle, where B0 is external magnetic induction and θ is the axis of rotation of the sample at an angle of approx. 54.74 ∘ to the external magnetic induction.
Notes:
  1. Much like in the case of solutions, MAS effectively averages orientation-dependent interactions and allow high resolution spectra.
  2. The rate of spinning must be greater than or equal to the magnitude of the anisotropic interaction to average it to zero.
Source:
PAC, 2021, 93, 647. (Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)) on page 695 [Terms] [Paper]
Citation: 'magic angle spinning' in IUPAC Compendium of Chemical Terminology, 5th ed. International Union of Pure and Applied Chemistry; 2025. Online version 5.0.0, 2025. https://doi.org/10.1351/goldbook.08377 RIS BibTex EndNote
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