Experimental Observation of a Peculiar Effect in Electron Paramagnetic Resonance Spectra for Nitroxides Undergoing Fast Spin Exchange: Emission
Barney L. Bales,
Miroslav Peric,
Robert N. Schwartz
Abstract:We report the experimental observation of an EPR spectral manifestation of spin exchange frequencies, ω ex , larger than the 15 N hyperfine separation, A 0 , predicted 50 years ago but previously not observed. For spectra with ω ex /γA 0 < 1, where γ is the gyromagnetic ratio of the electron, the spectrum consists of two "normal" spin modes each with one absorption and one dispersion component separated by A abs < A 0 . A abs decreases with ω ex . In stark contrast, when ω ex /γA 0 > 1, the spectrum consists o… Show more
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