A 94 GHz EPR Spectrometer with Fabry-Perot Resonator

Abstract
An EPR spectrometer is described working in the 94 GHz (W-band) frequency range. It comprises a Fabry-Perot type microwave resonator connected to a conventional microwave bridge, a phase lock loop for microwave frequency stabilization, and a superconducting magnet. The improved separation of W-band spectra from two sites with only slightly different g-factors is demonstrated using an α-bromo radical in an X-irradiated 5-bromodeoxyuridine single crystal as example.
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