I. Murakami, T. Kato, D. Kato, U.I. Safronova, T.E. Cowan and Yu. Ralchenko


Atomic Data for Dielectronic Recombinatin into Mg-like Fe

Date of publication:

Mar. 2006

Key words:

Mg-like iron, dielectronic recombination rate coefficients, energy levels, radiative transition probabilities, autoionization rates, excited states, dielectronic satellite lines


Energy levels, radiative transition probabilities, and autoionization ratesfor 1s^2 2s^2 2p^6 3l'nl (n=3-12, l leq n-1) and 1s^2 2s^2 2p^6 4l'nl (n=4-7, l leq n-1) states in Mg-like iron (Fe^14+) are calculated by the Hartree-Fock-Relativistic method (Cowan code) and the relativistic many-body perturbation theory method (RMBPT code). Autoionizing levels above three thresholds 1s^2 2s^2 2p^6 3s, 1s^2 2s^2 2p^6 3p, and 1s^2 2s^2 2p^6 3d are considered. It is found that configuration mixing [3sns + 3pnp + 3dnd], [3snp + 3pns + 3pnd + 3dnp] play an important role for all atomic characteristics. Branching ratios relative to the first threshold and intensity factors for satellite lines are calculated, and dielectronic recombination (DR) rate coefficients are determined for the excited 444 odd-parity and 419 even-parity states. It is shown that the contribution of the highly-excited states is very important for calculation of DR rates. Contributions from the excited 1s^2 2s^2 2p^6 3l'nl states with n leq 12 and 1s^2 2s^2 2p^6 4l'nl states with n leq 7 to DR rate coefficients are estimated by extrapolation of all atomic characteristics. The total DR rate coefficient is derived as a function of electron temperature.

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