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

✍ Scribed by Doty, F. David ;Entzminger, George ;Yang, Y. Andy

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
396 KB
Volume
10
Category
Article
ISSN
1043-7347

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✦ Synopsis

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 B 0 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, B homogeneity, B stability, and geometric compensation for variable angle 1 0 spinning resolution.

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In Part I, we review some basic physics, properties, and types of magnetism ( ) as they relate to high-resolution nuclear magnetic resonance NMR probe design, both in liquids and in solids, and some of the reasons it is technically difficult to obtain resolution of several parts per billion. We note