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The application of paramagnetic resonance absorption to the detection of organic free radicals is discussed. The advantages of this method over conventional measurements of magnetic susceptibility are illustrated by the results of measurements on p,p′-biphenylene-bis-(diphenylmethyl).

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Paramagnetic resonance absorption in solutions of K and Na in liquid NH3 has been investigated. The resonance has been studied at a frequency of approximately 7.0·106 cycle sec−1 and a magnetic field of 2.5 gauss. The measurements have been made at 240°K, 274°K, and 298°K and over a concentration range from 0.004 M to 0.7 M. The intensities and susceptibilities, spectroscopic splitting factors, widths, shapes, and extents of saturation of the resonances have been determined. The paramagnetic parts of the magnetic susceptibilities in static fields have been calculated from the rf data and have been compared with the susceptibilities measured in static fields by other investigators. The relations of the trapped electron model of such solutions to these quantitative measurements on the paramagnetic resonance absorption have been considered.

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