Energy levels, lifetimes, and transition rates for the selenium isoelectronic sequence Pd XIII–Te XIX, Xe XXI–Nd XXVII, W XLI

Abstract Energy levels, wavelengths, lifetimes, oscillator strengths, and electric dipole (E1), magnetic dipole (M1), electric quadrupole (E2), magnetic quadrupole (M2) transition rates among the 46 fine structure levels belonging to the ( [ Ar ] 3 d 10 ) 4 s 2 4 p 4 , ( [ Ar ] 3 d 10 ) 4 s 2 4 p 3 4 d , and ( [ Ar ] 3 d 10 ) 4 s 4 p 5 configurations for the selenium isoelectronic sequence Pd XIII–Te XIX, Xe XXI–Nd XXVII, W XLI are reported. These data are determined in the multi-configuration Dirac–Fock (MCDF) approach, in which relativistic effects, main electron correlations within the n = 7 complex, Breit interaction (BI), and quantum electrodynamic (QED) corrections are included. The many-body perturbation theory (MBPT) method is also employed as an independent calculation to confirm the present accuracy, taking W XLI as an example. Comparisons and analysis are made between the present results and available experimental and theoretical ones, and good agreements are obtained. These accurate data are expected to be useful in nuclear fusion research and astrophysical applications.