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- W1789277978 abstract "Shimming is the procedure of homogenizing a magnetic field, and is essential as a preparation for NMR measurements of high quality. This article is focused on shimming for high-resolution liquid-state NMR spectroscopy, in which the static field is created by means of superconducting magnets. Nevertheless, many of the principles and techniques described can be transferred to other situations. The commonly used type of shim system, which provides the correction fields as spherical harmonics, is derived from general considerations on electromagnetism. Being fundamental in shimming, the relationship between field inhomogeneity and spectral quality is elucidated. In this context, the shim criterion—the key parameter for shimming—is discussed in detail, and suitable optimization algorithms are described. These general principles are applied both to conventional and gradient shimming. In addition, means of providing a sufficient basic homogeneity are discussed, including magnet and probe design as well as the NMR sample itself.Keywords:field homogenization;Maxwell equations;spherical harmonics;gradient shimming;field mapping;shim criterion;line shape optimization;orthogonality;sample spinning;magnet design;probe design;magnetic materials" @default.
- W1789277978 created "2016-06-24" @default.
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- W1789277978 date "2011-12-15" @default.
- W1789277978 modified "2023-10-14" @default.
- W1789277978 title "Shimming for High-Resolution NMR Spectroscopy" @default.
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- W1789277978 doi "https://doi.org/10.1002/9780470034590.emrstm1228" @default.
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