On the influence of second-order splitting and sign of the coupling constant in the E.S.R. spectra of polyatomic free radicals

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Abstract
Second-order splitting has been observed in the E.S.R. spectrum of the monopositive ion of pyracene. Excellent agreement is found upon comparing the experimental transition frequencies and intensities with those predicted by theory. The observed line-width variations of the various hyperfine components indicate that the two isotropic coupling constants have opposite sign.

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