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Extended analysis of three-times ionized krypton (Kr IV)

The spectral analysis of three-times ionized krypton, Kr IV, was extended to include 3, 12, 7, 8 and 20 new level values of the configurations , , , and , respectively. Five known level values of the even configurations were redesignated and four levels were rejected. The observed configurations were interpreted theoretically by means of Hartree-Fock relativistic (HFR) calculations and a least-squares fit of the energy parameters to the observed levels. Rydberg series configuration interactions have also been included in the calculations.