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A semiempirical correction term, proportional to the "seniority operator" Q, is introduced into the Slater formulas for the configurations 3dⁿ4sᵏ of the second spectra of V, Cr, and Fe. The agreement with the experimental data, obtained by least squares, is improved by about 20%. The physical meaning of this correction is discussed.
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Racah et al. (1960) studied this question.
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