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Energy levels and Lande g-factors for the configurations 3 d   n  4 p +3 d   n -1 4 s 4 p+ 3 d   n -2 4 s  2 4 p in the first spectra of the iron group were calculated and compared with experimental values, in both general and individual treatments. The calculations were done in intermediate coupling taking into account explicity the interactions between configurations, as well as complete effective interactions of the core, and effective interactions d - p . Due to a successful starting point based on Hartree-Fock calculations for the Slater parameters, as well as the insertion of the effective interactions, considerable improvement was obtained compared to previous results. On fitting 1537 levels using 67 free interaction parameters a mean error of 182 cm -1 was obtained. Altogether 3652 energy levels were calculated including all the levels for the configurations 3 d   n -2 4 s  2 4 p across the sequence. It was shown that all interaction parameters could be expressed either as linear functions, or linear functions with small quadratic corrections, of the atomic number. There was general qualitative agreement between the values of the parameters calculated using the semi-empirical method and those calculated using Hartree-Fock methods. There remained some isolated terms with large deviations. These are attributed to be due to the interactions with the configurations (3 d+ 4 s )  n  5 p , that were not considered explicitly in this analysis. Tables comparing the experimental and calculated energy levels and Lande g-factors, as well as detailed analyses for each spectrum are given in another paper.

The Configurations 3dn4p+3dn-14s4p+3dn-24s24p in the First Spectra of the Iron Group