Two millimeter diameter spherical rotors spinning at 68 kHz for MAS NMR

• Spinning frequency > 68 kHz of 2 mm spherical rotors using helium spinning gas. Magic angle adjustment at 59.3 KMnO4. Nonregulated stability ±0.5% during data acquisition. Improvements on stator and RF coil results in three-fold increase NMR sensitivity. Customized narrow-bore transmission line probe for spheres. Spherical are a new paradigm magic (MAS) solid-state nuclear magnetic resonance (NMR). The simple geometry makes smaller diameter spheres their utilization within probes feasible. Here we report gas outside the magnet demonstrate use KMnO 4 to adjust MAS NMR. We observe third-order sidebands 55 Mn spectrum clearly showing kHz, with KBr nearly no first-order similar frequency. was acquisition without regulation. To address concerns about low filling factor spheres, employ modified achieve three times higher sensitivity then our previous geometries Advanced rotor fabrication technologies expected further