Abstract
Application of a ferroelectric resonator made from single-crystal potassium tantalate when placed on a sample holder in a standard electron paramagnetic resonance (EPR) cavity TE011, in X-band CW EPR experiments, allows to increase signal-to-noise ratio in 10-50 times, depending on the resonator type (geometry and shape). A ferroelectric resonator can significantly improve EPR sensitivity due to increasing the filling factor and the MW magnetic field at the sample, and may be especially usefiil for studying small, non-saturable samples. In the Pulsed EPR experiments the use of a ferroelectric resonator leads to the reduction of the incident power in 50 times, so, e.g. a ferroelectric W-band resonator could permit much shorter nil pulses than are now possible. Here we present the determination of the dimensions of the ferroelectric resonators for EPR spectrometers at high frequencies, 35, 65, and 125 GHz. The results of the calculations and possible resonator materials are discussed.
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