Abstract
Relativistic configuration interaction results are presented for several B-like ions (Ge XXVIII, Rb XXXIII, Sr XXXIV, Ru XL, Sn XLVI, and Ba LII) using the multi-configuration Dirac–Hartree–Fock (MCDHF) method. The calculations are carried out in the active space approximation with the inclusion of the Breit interaction, the finite nuclear size effect, and quantum electrodynamic corrections. Results for fine structure energy levels for 1s22s22p and 2s2p2 configurations relative to the ground state are reported. The transition wavelengths, transition probabilities, line strengths, and absorption oscillator strengths for 2s22p–2s2p2 electric dipole (E1) transitions are calculated. Both valence and core-valence correlation effects were accounted for through single-double multireference (SD-MR) expansions to increasing sets of active orbitals. Comparisons are made with the available data and good agreement is achieved. The values calculated using core–valence correlation are found to be very close to other theoretical and experimental values. The behavior of oscillator strengths as a function of nuclear charge is studied. We believe that our results can guide experimentalists in identifying the fine-structure levels in their future work.
Highlights
For ions with three electrons in the valence shell, it is quite simple to take all the configuration interactions between the states of the ground complex into consideration
A very efficient way to ensure the convergence of atomic property within a certain correlation model is to use the active set approach to enlarge the configuration expansion systematically
Correlations, calculations were performed with configuration state functions (CSFs) generated by single and double excitations from the 2s and 2p shells of the reference configurations 2s2 2p and 2s2p2 to the active set
Summary
For ions with three electrons in the valence shell, it is quite simple to take all the configuration interactions between the states of the ground complex into consideration. The calculated results are useful in the case of yet unobserved transitions and for determining the density and temperature of the solar corona or in the diagnostic studies of thermonuclear plasmas. The spectral studies of boron-isoelectronic sequence are of great importance in diagnostics of solar, astrophysical, and fusion plasmas [2,3]. Transitions within n = 2 complex of ions in the boron isoelectronic sequences have been observed in tokamak [4,5] and astrophysical plasmas [6]. Transition within the 2s2 2p ground configuration are useful for diagnostics of electron densities in the range 1012 to 1014 cm3 [7,8]. Germanium is a useful element for plasma diagnostics [9]
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