 |
Center for Nonlinear Studies |
Dielectronic recombination (DR) is the dominant recombination mechanism in photoionized and collisionally-ionized plasmas. Accurate DR rate coefficients are thus important for determining the charge state balance and spectra of these plasmas. Over the past few years, we have been involved in a large effort to compute accurate DR and radiative recombination (RR) rate coefficients for all isoelectronic sequences up through Mg-like ions using the state-of-the-art atomic structure and collision code AUTOSTRUCTURE. Calculations for higher sequences beyond Mg-like ions have proved to be more complicated due to the increasing number of M-shell electrons. In this talk, I will describe DR calculations for M-shell Ar ions and the Al-like isoelectronic sequence. DR data for M-shell Ar ions was needed for tokamak transport modeling, and we have used a configuration-average approach for treating these ions. For the Al-like isoelectronic sequence, on the other hand, level-resolved AUTOSTRUCTURE calculations were performed. Results will be compared with earlier theoretical work and the existing experimental data for Fe13+, and the importance of fine structure will be discussed.
Host: James Colgan, jcolgan@lanl.gov