A multifrequency high-field pulsed electron paramagnetic resonance/electron-nuclear double resonance spectrometer

Morley, Gavin W.; Brunel, Louis-Claude; van Tol, Johan
June 2008
Review of Scientific Instruments;Jun2008, Vol. 79 Issue 6, p064703
Academic Journal
We describe a pulsed electron paramagnetic resonance spectrometer operating at several frequencies in the range of 110–336 GHz. The microwave source at all frequencies consists of a multiplier chain starting from a solid state synthesizer in the 12–15 GHz range. A fast p-i-n-switch at the base frequency creates the pulses. At all frequencies a Fabry–Pérot resonator is employed and the π/2 pulse length ranges from ∼100 ns at 110 GHz to ∼600 ns at 334 GHz. Measurements of a single crystal containing dilute Mn2+ impurities at 12 T 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 39K nuclei in Cr:K3NbO8.


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