title: Rapid scan electron paramagnetic resonance at 1.0 GHz of defect centers in γ-irradiated organic solids.
abstract: The radicals in six60Co γ-irradiated solids: malonic acid, glycylglycine, 2,6 di-t-butyl 4-methyl phenol, L-alanine, dimethyl malonic acid, and 2-amino isobutyric acid, were studied by rapid scan electron paramagnetic resonance at L-band (1.04 GHz) using a customized Bruker Elexsys spectrometer and a locally-designed dielectric resonator. Sinusoidal scans with widths up to 18.2 mT were generated with the recently described coil driver and Litz wire coils. Power saturation curves showed that the rapid scan signals saturated at higher powers than did conventional continuous wave signals. The rapid scan data were deconvolved and background subtracted to obtain absorption spectra. For the same data acquisition time the signal-to-noise for the absorption spectra obtained in rapid scans were 23 to 37 times higher than for first-derivative spectra obtained by conventional continuous wave electron paramagnetic resonance.
authors.affiliation: Department of Chemistry and Biochemistry, University of Denver, Denver, CO 80208.
authors.forename: Yilin
authors.initials: Y
authors.lastname: Shi
authors.affiliation: School of Engineering and Computer Science, University of Denver, Denver, CO 80208.
authors.forename: George A
authors.initials: GA
authors.lastname: Rinard
authors.affiliation: School of Engineering and Computer Science, University of Denver, Denver, CO 80208.
authors.forename: Richard W
authors.initials: RW
authors.lastname: Quine
authors.affiliation: Department of Chemistry and Biochemistry, University of Denver, Denver, CO 80208.
authors.forename: Sandra S
authors.initials: SS
authors.lastname: Eaton
authors.affiliation: Department of Chemistry and Biochemistry, University of Denver, Denver, CO 80208.
authors.forename: Gareth R
authors.initials: GR
authors.lastname: Eaton
keywords: 60Co γ-irradiated solids; L-band; electron paramagnetic resonance; rapid scan; signal-to-noise
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