Dynamic-Angle Spinning (DAS) is a solid-state NMR method for obtaining a high resolution spectrum of half-integer spin quadrupolar nuclei. It was first described by Professor Alexander Pines and coworkers at UC Berkeley, and by Drs. Joseph Virlet and Antoine Llor at the CEA in Saclay, France. It is performed as a two-dimensional NMR experiment, and correlates a high resolution (isotropic) spectrum to the anisotropic central transition VAS spectrum.
These are the two most basic DAS sequences. For additional implementation details (phase cycling and data processing), please see the references below, particularly, Grandinetti et al., J. Magn. Reson. A, 103, 72 (1993)
Double-Tuned Hopping-Coil Probe for Dynamic-Angle Spinning,
Sideband Patterns in Dynamic-Angle Spinning NMR,
Pure Absorption Mode Spectra and Sensitivity in Two-Dimensional Dynamic-Angle Spinning NMR,
Cross-Polarization dynamic-angle spinning nuclear magnetic resonance of quadrupolar nuclei,
Dynamic-Angle Spinning and Applications,