title: A multifrequency high-field pulsed electron paramagnetic resonance/electron-nuclear double resonance spectrometer.
abstract: 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-Perot resonator is employed and the pi/2 pulse length ranges from approximately 100 ns at 110 GHz to approximately 600 ns at 334 GHz. Measurements of a single crystal containing dilute Mn(2+) 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 (39)K nuclei in Cr:K(3)NbO(8).
authors.affiliation: Center for Interdisciplinary Magnetic Resonance, National High Magnetic Field Laboratory, Florida State University, Tallahassee, FL 32310, USA. g.morley@ucl.ac.uk
authors.forename: Gavin W
authors.initials: GW
authors.lastname: Morley
authors.forename: Louis-Claude
authors.initials: LC
authors.lastname: Brunel
authors.forename: Johan
authors.initials: J
authors.lastname: van Tol