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A variational method, employing the unrestricted Hartree-Fock approximation, is proposed for the calculation of isotropic magnetic hyperfine constants in paramagnetic atoms and ions with unpaired electrons in non-S states and in free radicals. The method is applied to the ground state of the nitrogen atom. The N14 hyperfine constant in the ground state is calculated to be +7.3 Mc as compared to the recent experimental value of +10.4509±0.0003 Mc. Reasons for the discrepancy are discussed.
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Das et al. (1960) studied this question.
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