Studies on E2 Transition in the Na‐like Highly Stripped Ion Fexvi

The spectrum of the solar corona and plasma spectra in astrophysical objects and fusion devices exhibit forbidden lines in alkali-like ions. Ions belonging to the iron group are particularly important in this respect. The electric quadrupole (E2) transitions for Fe XVI are computed using the highly correlated relativistic wave function obtained by using coupled cluster theory including all single, double, and some triple excitations from the core. Term values of the present ion obtained by our method are compared with the available experimental and theoretical data. The detailed highly accurate relativistic data for line strengths and transition probabilities are presented for a large number of transitions of low transition rates, and a few of both of them are compared with existing data as samples.