• Relativistic configuration interaction and many-body perturbation theory of energy levels, wavelengths, oscillator strengths, radiative rates and lifetimes of He-like lithium

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    • Keywords

       

      Energy levels; lifetimes; oscillator strengths; radiative rates; relativistic configuration interaction; many-body perturbation theory

    • Abstract

       

      The aim of this work is to provide energy level calculations among the lowest 71 levels arising out of 1$s^2$ and 1$snl$ ($n ≤ 6, l ≤ (n − 1)$) configurations of He-like lithium. The calculations are carried out through the relativistic configuration interaction approach and the second-order many-body perturbation theory implemented in the flexible atomic code. We provide accurate calculations of energy levels, lifetimes, wavelengths, weighted oscillator strengths and radiative rates for the allowed ($E1$) transitions of He-like lithium. We have also considered relativistic effects by incorporating quantum electrodynamics and Breit corrections. The radiative lifetimes are reported for all the calculated levels. The present results are in good agreement with the previous results in literature (theoretical and experimental data). Several new energy levels and wavelengths were found out where no other theoretical or experimental results are available. We expect that our extensive calculations will be useful to experimentalists for identifying the fine-structure levels.

    • Author Affiliations

       

      SOUMAYA MANAI1 2 3 HAIKEL JELASSI1 2

      1. Research Laboratory on Energy and Matter for Nuclear Sciences Development, LR16CNSTN02 Tunis, Tunisia
      2. National Center for Nuclear Sciences and Technologies, Sidi Thabet Technopark, 2020 Ariana, Tunisia
      3. 3Faculty of Sciences of Bizerte, University of Carthage, Tunis, Tunisia
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