We describe a pulsed electron paramagnetic resonance spectrometer operating at several frequencies in the range of . The microwave source at all frequencies consists of a multiplier chain starting from a solid state synthesizer in the range. A fast -switch at the base frequency creates the pulses. At all frequencies a Fabry–Pérot resonator is employed and the pulse length ranges from at at . Measurements of a single crystal containing dilute impurities at illustrate the effects of large electron spin polarizations. The capabilities also allow for pulsed electron-nuclear double resonance (ENDOR) experiments as demonstrated by Mims ENDOR of nuclei in .
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2008
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