Overhauser Effect in Nonmetals

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Abstract
A survey is made of different ways in which nuclear spins can relax through their interaction with electronic spins. It is shown that the maximum amount of nuclear polarization which can be obtained by saturating the electronic resonance depends: (a) on the type of interaction between electronic and nuclear spins, namely dipole-dipole type, scalar product type, or any combination of the two; (b) on the mechanism whereby the "lattice" provides the energy for the relaxation.