Magnetism in high-resolution NMR probe design. II: HR MAS

Abstract

Various issues affecting nuclear magnetic resonance probe resolution are discussed, with emphasis on high-resolution or magic angle spinning (MAS) in this part. Symmetric positioning of chip capacitors at the magic angles addresses the largest B0 perturbation with ultra-low-inductance decoupling coils, and symmetric spinner drive designs with silicon-nitride coilforms are shown to be extremely beneficial in reducing spinning-, decoupling-, and variable temperature-induced thermal gradients. Other factors discussed include MAS sample cell design, high frequency (HF) coils, centrifugation, shimming, B1 homogeneity, B0 stability, and geometric compensation for variable angle spinning resolution. ©1998 John Wiley & Sons, Inc. Concepts Magn Reson 10: 239–260, 1998