The N ion was produced in neon plasma and isolated in solid neon at 4 K. Its X-band electron-spin-resonance (ESR) spectrum was analyzed to yield the isotropic hyperfine interaction of 441 MHz with the 23 Na ( I = 3 / 2 ) nucleus. An approximate interpretation of this value points to considerable pσ character in the predominantly sσ wave function of the single valence electron in the ground 2 state.
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Weimer et al. (2000) studied this question.
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