Nuclear-electron double resonance in solutions of potassium nitrosyl sulphonate and of potassium nitrosyl pentacyano chromium (III)

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Abstract
The effect on the nuclear resonance spectra of exciting the electron resonance in solutions of free radicals has been studied in a magnetic field of about 3000 G. The nuclei and electrons are coupled by dipole-dipole interactions. The nuclear polarization produced by a given microwave power varies in a roughly linear manner with the logarithm of the concentration of radical and this can be interpreted in terms of a set of rate equations relating the build up and decay of nuclear polarization. The presence of oxygen or of para ­ magneticions reduces the nuclear polarization obtainable, and it is established that this effect depends primarily on the change of the nuclear spin-lattice relaxation time. A quantitative discussion of these effects is given.