title: Frequency dependence of EPR signal-to-noise.
abstract: Direct measurements of electron spin-echo signal and noise in well-characterized X-band and S-band spectrometers agree with predictions of frequency dependence based on first principles. For the particular spectrometers compared, the echo at 9.52 GHz was 9.5 times larger than the echo at 2.68 GHz, after scaling for differences in spectrometer gain. The calculated ratio was 7.6. This result contrasts with prior predictions that the frequency dependence would be much greater.
authors.affiliation: Department of Chemistry and Biochemistry, University of Denver, Denver, Colorado 80208, USA.
authors.forename: G A
authors.initials: GA
authors.lastname: Rinard
authors.forename: R W
authors.initials: RW
authors.lastname: Quine
authors.forename: J R
authors.initials: JR
authors.lastname: Harbridge
authors.forename: R
authors.initials: R
authors.lastname: Song
authors.forename: G R
authors.initials: GR
authors.lastname: Eaton
authors.forename: S S
authors.initials: SS
authors.lastname: Eaton
mesh_terms: D004578:Electron Spin Resonance Spectroscopy / Q000295:instrumentation*; D004867:Equipment Design; D008433:Mathematics; D012815:Signal Processing, Computer-Assisted