Spectral Data in Sr XIV, Ru XX, Rh XXI, and Pd XXII of Fusion Interest

Abstract

A comprehensive computational study of the energy levels and lifetimes of the 64 states arising from the 3s² 3p⁶ 3d⁷ and 3s² 3p⁵ 3d⁸ configurations of Sr XIV, Ru XX, Rh XXI, and Pd XXII of fusion interest is carried out via the relativistic multiconfiguration Dirac–Hartree–Fock method followed by calculations that consider the correlations within the n = 8 complex, the Breit interaction, self-energy, and vacuum polarization corrections. Moreover, to display detailed information about the decay properties of these ions, the radiative transition wavelengths and emission transition probabilities of the electric dipole, electric quadrupole, magnetic dipole, and magnetic quadrupole transitions among the levels of the above configurations are given. The energy-level calculations are performed by taking the fully relativistic flexible atomic code as an independent check on the present values. Comparisons are made between the two datasets used here and previous experimental and computational work, and good agreement is found. The results reported here are useful for the identification of emission lines and in the field of fusion modeling, where experimental data are limited.