Analysis of an EPR 10 GHz probe with a rotatable HF field

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Abstract
An EPR probe with a 10 GHz cylindrical cavity working at liquid helium temperatures, is described. From the exterior of the dewar, the resonance frequency of the cavity can be tuned, its coupling with the coaxial line modified and, moreover, the direction of the HF field in the cavity charged. From the study of the EPR signal amplitude of a DPPH sample against the angle between the microwave field h and the DC field H it is inferred that the angular difference between the direction of h and the direction normal to the coupling loop plane never goes beyond 5 degrees .

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