Abstract
Fast ( > 40 kHz) magic-angle spinning (fast MAS) has reshaped solid-state NMR conceptually, enhanced performance in conventional categories, and introduced new experiments. The improvements are particularly marked for 1H and paramagnetic center-related effects. The reduction of rotor size provides higher RF fields, technically far less demanding support for motion at lower temperatures (CryoMAS) and faster response to the effects of variable angle or speed ramp operation. Rotation frequencies approaching 100 kHz mean that the mechanically imposed motion may not be the “slow” process in the timescale of spin and molecular dynamics, opening up a range of new applications. A combination of low-power decoupling and paramagnetic doping shifts the center of gravity in protein NMR experiments toward fast MAS methods. Keywords: magic-angle spinning; NMR; fast MAS; gas lubrication; CryoMAS; sensitivity; amyloid fibril; paramagnet-enhanced relaxation; spin diffusion
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