title: Skew projection of echo-detected EPR spectra for increased sensitivity and resolution.
abstract: The measurement of EPR spectra during pulsed EPR experiments is commonly accomplished by recording the integral of the electron spin echo as the applied magnetic field is stepped through the spectrum. This approach to echo-detected EPR spectral measurement (ED-EPR) limits sensitivity and spectral resolution and can cause gross distortions in the resulting spectra because some of the information present in the electron spin echo is discarded in such measurements. However, Fourier transformation of echo shapes measured at a series of magnetic field values followed by skew projection onto either a magnetic field or resonance frequency axis can increase both spectral resolution and sensitivity without the need to trade one against the other. Examples of skew-projected spectra with single crystals, glasses and powders show resolution improvements as large as a factor of seven with sensitivity increases of as much as a factor of five.
authors: Department of Chemistry, The University of Alabama, Tuscaloosa, AL 35487-0336, USA. mkbowman@as.ua.edu
authors: Michael K
authors: MK
authors: Bowman
authors: Matthew D
authors: MD
authors: Krzyaniak
authors: Alex A
authors: AA
authors: Cruce
authors: Ralph T
authors: RT
authors: Weber
mesh_terms: D000465:Algorithms; D016477:Artifacts; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods*; D005583:Fourier Analysis; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted
references: Phys Rev B Condens Matter. 1990 Mar 1;41(7):3905-3913
references: 9994206