Isoelectronic studies of the 4s4p^3PJ energy levels in the Zn sequence

Screening parameterizations of the spin–orbit and exchange energies are used to systematize available data accurately for the 4s4p configuration in the Zn isoelectronic sequence. Through the availability of precision measurements of the 4s21S0–4s4p1P1 resonance transition, these screening parameterizations are used to make accurate interpolative and extrapolative predictions of the excitation energies of the 4s4p3PJ levels for ions from Ge iii through Ba xxvii These results also provide extrapolative predictions of the magnetic-dipole, electric-quadrupole, and intercombination transitions in this system that sometimes occur in localized diagnostics of high-temperature plasmas.