Dielectronic Recombination Rate Coefficients to Excited States of Carbonlike Oxygen and Dielectronic Satellite Lines

We calculate energy levels, radiative transition probabilities, and autoionization rates for Be-like oxygen (O 4+ ) including 1s 2 2lnl � (n = 2-8, l ≤ n − 1) and 1s 2 3lnl (n = 3-6, l ≤ n − 1) states by the multiconfigurational Hartree-Fock method (Cowan code) and the perturbation theory Z-expansion method (MZ code). The state selective dielectronic recombination-rate coefficients to excited states of Be-like oxygen are obtained, which are useful for modeling O V spectral lines in a recombining plasma. Configuration mixing plays an important role for the principal quantum number, n, distribution of the dielectronic recombination-rate coefficients for 2snl (n ≤ 5) levels at low electron temperature. The orbital angular momentum quantum number, l, distribution of the rate coefficients shows a peak at l = 4. The total dielectronic recombination-rate coefficient is derived as a function of electron temperature. The dielectronic satellite lines are also obtained.