Magnetism in high-resolution NMR probe design. I: General methods

Abstract

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 the beneficial attributes of elliptical symmetries and the finite magic angle cylinder; and some methods of calculating fields produced by various objects are reviewed, with emphasis on the method of effective surface currents. Using a novel dual-ring method, the high-field magnetic properties of various materials important to NMR probe construction are obtained. Methods of adjusting and controlling the susceptibility of special adhesives, wire, foil, and dewar alloys are discussed. In Part II, we will look more specifically at high-resolution magic angle spinning probe design issues. ©1998 John Wiley & Sons, Inc. Concepts Magn Reson 10: 133–156, 1998