Relativistic calculations of 3s^{2 1}S₀–3s3p ¹P₁ and 3s^{2 1}S₀–3s3p ³P_1,2 transition probabilities in the Mg isoelectronic sequence

Using the multi-configuration Dirac–Fock self-consistent field method and the relativistic configuration-interaction method, calculations of transition energies, oscillator strengths and rates are performed for the 3s^{2 1}S₀–3s3p ¹P₁ spin-allowed transition, 3s^{2 1}S₀–3s3p ³P_1,2 intercombination and magnetic quadrupole transition in the Mg isoelectronic sequence (Mg I, Al II, Si III, P IV and S V). Electron correlations are treated adequately, including intravalence electron correlations. The influence of the Breit interaction on oscillator strengths and transition energies are investigated. Quantum electrodynamics corrections are added as corrections. The calculation results are found to be in good agreement with the experimental data and other theoretical calculations.