Breit-Pauli energy levels belonging to 2p4 2s2p5, 2p6, 2p3 3l configurations and all E1 transitions among these levels in MgV

We present accurate oscillator strengths, line strengths and radiative rates for 1073 El transitions among the 86 levels belonging to 2s(2)2p(4), 2s2p(5), 2p(6), 2s(2)2p(3)(S-4 degrees, D-2(o), P-2 degrees)3l configurations in Mg V. We have used Is and 2s Hartree-Fock orbitals, re-optimized 2p oil 2p(3)(2D degrees)3s D-3 degrees and optimized 3s,3p,3d orbitals on real states. Sixteen additional orbitals up to 8d are optimized either as a correction to n = 3 physical orbitals or as a correlation orbital. A very large set of configurations including up to three electron promotions are used to account for all important correlation effects. All of the main five terms in the Breit-Pauli operator (except the orbit-orbit interaction) are included in order to account for the relativistic effects. Small adjustments to the diagonal elements of the Hamiltonian matrix are made to bring the calculated energies within a few cm(-1) of the corresponding NIST recommended data wherever available. The calculated oscillator strengths, line strengths, and radiative rates for almost all of the El transitions show excellent agreement with the corresponding MCDF results of Fischer. The recent results of Bhatia et al. are found to be consistently higher by 20-45%. The accuracy of the present calculation is considered to be better than the NIST accuracy ratings for various transitions. (c) 2007 Elsevier Inc. All rights reserved.