magic angle spinning nuclear magnetic resonance spectroscopy 31P nuclear magnetic resonance spectroscopy 31P magic angle spinning nuclear magnetic resonance spectroscopy 31P MAS NMR 31P-MAS-NMR Spectroscopy where the energy states of 31P nuclei placed in a static magnetic field are interrogated by inducing transitions between the states via radio frequency irradiation. Each experiment consists of a sequence of radio frequency pulses with delay periods in between them Anisotropic interactions between nuclei, which are usually averaged by Brownian motion in liquid samples, cause significant line broadening in solid-state NMR, but can be averaged to zero by spinning the sample very rapidly at the magic angle (54.74° with respect to the direction of the magnetic field). 31P MAS-NMR CHMO:0000855