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5 - Nuclear Magnetic Resonance and Relaxation

Published online by Cambridge University Press:  03 February 2020

Tapio O. Niinikoski
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Summary

We shall first discuss the origin of the spins and magnetic dipole moments of the nucleons and nuclei. The nuclear magnetic resonance (NMR) lineshape will then be reviewed in general theoretical terms first, before turning to the microscopic sources of line broadening and frequency shifts that are valid for solid materials only. The relaxation mechanisms of nuclear spins will then be described, focusing on relaxation via paramagnetic electrons. During frozen spin operation the polarization loss is different for positive and negative polarization, which is explained by the polarization-dependent heat transfer from the nuclear spins to the liquid helium coolant.

Keywords

Nuclear dipole momentquadrupole momenttransverse magnetic susceptibilitylinear response theorydipolar interactionquadrupolar interactionmolecular spin isomersindirect spin interactionshyperfine interactionnuclear spin relaxation.
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Chapter
Information
The Physics of Polarized Targets , pp. 199 - 244
Publisher: Cambridge University Press
Print publication year: 2020

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