Abstract
Apparatus is described for measuring nuclear electron double resonances a t magnetic fields of 12500 G, in the microwave radiation of about 35000 Mc/s and at nuclear resonance frequencies from 3 to 60 Mc/s. The microwave circuit permits saturation of solutions of certain organic free radicals in solution in non-polar solvents when placed in a microwave cavity with a radio-frequency coil mounted inside. The resolving power of the nuclear resonance spectrometer is better than 1 in 10
8
. Recordings are presented to illustrate the performance of the apparatus.
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