Need of LS-Dependent Energy Parameters in the Second Spectra of the Fifth-Group Elements

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Abstract
In the analysis of As II, the usual Slater—Condon treatment was found unsatisfactory for the multiconfiguration group 4s4p3-4p4d-4p5d-4p6d-4p7s. It was found that when LS-dependent parameters were introduced there was a substantial improvement of the agreement between experimental and calculated energy levels and for the Landé g factors as well. We carried out Hartree—Fock (HF) solutions for each term of this multiconfiguration and obtained convincing evidence of the necessity for LS-dependent parameters. In N II, P II, Sb II, and Bi II, we found the same pattern to hold in the HF solutions for the sp3 and the corresponding first three pd configurations.

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