Atomic Data for Dielectronic Recombination Into C-like Oxygen

Published

October 16, 2008

Author(s)

U I. Safronova, I Murakami, T Kato, D Kato, Y Ralchenko

Abstract

Energy levels, radiative transition probabilities, and autoionization rates for C-like oxygen (O$^2+}$) including $1s^22s^22pnl$, $1s^22s2p^2nl$, and $1s^22p^3nl$ ($n$=2-8, $l \le n-1$) states are calculated by theHartree-Fock-Relativistic method (Cowan code). Autoionizing levels above the thresholds $1s^22s^22p\ ^2P$, $1s^22s2p^2\ ^4P,\ ^2D,\ ^2S,\ ^2P$, and $1s^22p^3\ ^4S,\ ^2D$ are considered. Configuration mixing $2s^22pnl$ + $2p^3nl$ plays an important role for all atomic characteristics. Branching ratiosrelative to the first threshold and intensity factors are calculated for satellites lines, and dielectronic recombination rate coefficients are presented for the excited 218 odd-parity and 218 even-parity states. The dielectronicrecombination (DR) rate coefficients are calculated including $1s^22s^22pnl$, $1s^22s2p^2nl$, and $1s^22p^3nl$ ($n$=2-8, $l \le n-1$) states. Contributions from the excited states with $n \ge 8$ are estimated by extrapolation of all atomic characteristics to derive the total DR rate coefficient. It is found that the orbital angular momentum quantum number $l$ distribution of the rate coefficients shows a peak at $l$=4. The total DR rate coefficient is derived as a function of electron temperature. The state-selective DR rate coefficients to excited states of C-like oxygen, which are useful for modeling O III spectral lines in a recombining plasma, are calculated as well.excited states of C-like oxygen, which are useful for modeling O III spectrallines in a recombining plasma, are calculated as well.

Citation

Physica Scripta

Volume

73

Pub Type

Journals

Keywords

dielectronic recombination, energy levels, rate coefficients, satellite lines, transition probabilities

Citation

Safronova, U. , Murakami, I. , Kato, T. , Kato, D. and Ralchenko, Y. (2008), Atomic Data for Dielectronic Recombination Into C-like Oxygen, Physica Scripta (Accessed April 20, 2024)