title: UHF EPR spectrometer operating at frequencies between 400 MHz and 1 GHz.
abstract: A spectrometer was designed and constructed to facilitate measurements of T1, T2, spin echo signal-to-noise, and resonator quality factor, Q, between about 400 and 1000 MHz. Pulse patterns are generated at 250 MHz and mixed with the output from a second source to perform excitation and detection. A cross-loop resonator was constructed in which the same sample could be measured in the same resonator over the full range of frequencies. An air-core, 4-coil, water-cooled electromagnet with a large experimental volume was built.
authors.affiliation: Ritchie School of Engineering and Computer Science, University of Denver, Denver, Colorado 80210 USA.
authors.forename: Richard W
authors.initials: RW
authors.lastname: Quine
authors.affiliation: Ritchie School of Engineering and Computer Science, University of Denver, Denver, Colorado 80210 USA.
authors.forename: George A
authors.initials: GA
authors.lastname: Rinard
authors.affiliation: Department of Chemistry and Biochemistry, University of Denver, Denver, Colorado, 80210 USA.
authors.forename: Yilin
authors.initials: Y
authors.lastname: Shi
authors.affiliation: Department of Chemistry and Biochemistry, University of Denver, Denver, Colorado, 80210 USA.
authors.forename: Laura
authors.initials: L
authors.lastname: Buchanan
authors.affiliation: Department of Chemistry and Biochemistry, University of Denver, Denver, Colorado, 80210 USA.
authors.forename: Joshua R
authors.initials: JR
authors.lastname: Biller
authors.affiliation: Department of Chemistry and Biochemistry, University of Denver, Denver, Colorado, 80210 USA.
authors.forename: Sandra S
authors.initials: SS
authors.lastname: Eaton
authors.affiliation: Department of Chemistry and Biochemistry, University of Denver, Denver, Colorado, 80210 USA.
authors.forename: Gareth R
authors.initials: GR
authors.lastname: Eaton
keywords: adjustable frequency; cross-loop resonator; frequency mixing