has proper occurrent part solid-state nuclear magnetic resonance spectroscopy magic angle spinning nuclear magnetic resonance spectroscopy MAS NMR MAS NMR spectroscopy ss-MAS-NMR magic-angle spinning MAS-NMR magic angle spinning nuclear magnetic resonance spectrometry NMR spectroscopy using a solid sample and involving magic angle spinning. solid-state magic-angle-spinning NMR SS-MAS NMR CHMO:0000615 FIX:0000471 magic angle spinning