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

Energy level ( E ), radiative transition probability ( Ar ), and autoionization rate ( Aa ) for Be-like Fe 22+ 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 1s 2 3 lnl ' as well as the 1s 2 2p nl 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 1s 2 2p nl and those from the 1s 2 3 lnl ' dominate at low and at high temperature, respectively. The comparison of the dielectronic recombination processes for Fe 22+ and C 2+ 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.