Energy levels and radiative rates for transitions in Fe V, Co VI and Ni VII

M. Aggarwal (1), P. Bogdanovich (2), F. P. Keenan (1), R. Kisielius (2)

(1) Astrophysics Research Centre, School of Mathematics and Physics, Queen’s University Belfast, Belfast BT7 1NN, Northern Ireland, UK. (2) Institute of Theoretical Physics and Astronomy, Vilnius University, Sauletekio al. 3, LT-10222 Vilnius, Lithuania.

Energy levels, Landé g-factors and radiative lifetimes are reported for the lowest 182 levels of the 3d4, 3d3.4s and 3d3.4p configurations of Fe V, Co VI and Ni VII. Additionally, radiative rates (A-values) have been calculated for the E1, E2 and M1 transitions among these levels. The calculations have been performed in a quasi-relativistic approach (QR) with a very large configuration interaction (CI) wavefunction expansion, which has been found to be necessary for these ions. Our calculated energies for all ions are in excellent agreement with the available measurements, for most levels. Discrepancies among various calculations for the radiative rates of E1 transitions in Fe V are up to a factor of two for stronger transitions ( f ≥ 0.1), and larger (over an order of magnitude) for weaker ones. The reasons for these discrepancies have been discussed and mainly are due to the differing amount of CI and methodologies adopted. However, there are no appreciable discrepancies in similar data forM1 and E2 transitions, or the g-factors for the levels of Fe V, the only ion for which comparisons are feasible.

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