The study of the core-valence and core-core correlation effects on the radiative properties along the magnesium isoelectronic sequence

We investigated the effect of core-valence and core-core correlations on the energy levels and transition probabilities along the Mg isoelectronic sequence from Si2+ to U80+. In order to attain a certain accuracy for the atomic structure we considered configurations obtained by electron promotions from the n = 3 up to n = 7 valence shells. Core-valence and core-core correlations are systematically included in the model by allowing single and double electron promotions from the n = 2 core up to the n = 6 and n = 5 shells with l <= 4 and l <= 2, respectively. The present results contain the energy of the levels arising from the valence configurations along with oscillator strengths and radiative rates corresponding to El, M1, E2, M2 transitions between states arising from 3l3l' with l, l' < 2 and 3snl '' with n <= 7 and l '' <= 4 configurations. We conclude the data accuracy trend along the magnesium isoelectronic sequence as a result of the detailed study of the correlation effects on the radiative properties. The core-valence correlations generally improve both energy and radiative rate values, while the core-core correlations mostly give better oscillator strengths but may slightly increase the energy deviations. The calculations have been performed by employing the fully relativistic model-potential Flexible Atomic Code. (C) 2018 Elsevier Inc. All rights reserved.