Dielectronic recombination to the excited states of Be-like Fe ions

Abstract

Energy level (E), radiative transition probability (Ar), and autoionization rate (Aa) for Be-like Fe22+ ion are calculated with use of Cowan's code. Using these atomic data, the dielectronic recombination rate coefficient (α) to the excited states and the intensity factor (Qd) of the dielectronic satellite lines have been calculated. The doubly excited states 1s23lnl' as well as the 1s22pnl are considered. The results are given in tables and figures. The n- and l-dependence for Ar, Aa, and α is studied. With use of it, Aa and Ar at large n are extrapolated. The dielectronic recombination processes from the 1s22pnl and those from the 1s23lnl' dominate at low and at high temperature, respectively. The comparison of the dielectronic recombination processes for Fe22+ and C2+ ions is discussed in order to understand the atomic nuclear charge scaling. The qualitative different behaviors for E, Ar, and α between Be-like ions and He-like ions are also discussed with use of atomic nuclear charge scaling.