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NMR Imaging of Materials$
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Bernhard Blumich

Print publication date: 2003

Print ISBN-13: 9780198526766

Published to Oxford Scholarship Online: January 2010

DOI: 10.1093/acprof:oso/9780198526766.001.0001

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NMR spectroscopy

NMR spectroscopy

Chapter:
(p.67) 3 NMR spectroscopy
Source:
NMR Imaging of Materials
Author(s):

Bernhard Blümich

Publisher:
Oxford University Press
DOI:10.1093/acprof:oso/9780198526766.003.0003

The appearance of nuclear magnetic resonance (NMR) spectra is determined by various interactions of the nuclear spins with each other, as well as with quantities such as the local and applied magnetic fields, the electric field gradient, and the coupling to the surroundings or the lattice. These interactions not only determine the particular resonance frequencies, but also lineshapes and relaxation times. In solids, the description of the spin interactions is far more complicated than in liquids, because molecular motion is slow on the NMR timescale. As a consequence, many interactions affect the frequency and intensity of the resonance, which are ineffective under fast motion as in liquids. For NMR imaging in materials science, these interactions are important, because most materials are solids and their characterisation and image contrast can be explained. This chapter reviews the basic nuclear spin interactions and some elementary techniques of solid-state NMR spectroscopy relevant to imaging. Anisotropic nuclear spin interactions are discussed, along with wideline NMR, echoes, and relaxation.

Keywords:   nuclear magnetic resonance spectroscopy, nuclear spins, resonance frequencies, relaxation times, echoes, liquids, solids, molecular motion, imaging

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