2011A&A...528A..69L

We present results for the electron-impact excitation of all Li-like ions from Be⁺ to Kr³³⁺ which we obtained using the radiation- and Auger-damped intermediate-coupling frame transformation R-matrix approach. We have included both valence- and core-electron excitations up to the 1s²5l and 1s2l4l' levels, respectively. A detailed comparison of the target structure and collision data has been made for four specific ions (O⁵⁺, Ar¹⁵⁺, Fe²³⁺ and Kr³³⁺) spanning the sequence so as to assess the accuracy for the entire sequence. Effective collision strengths (Υs) are presented at temperatures ranging from 2x10²(z+1)²K to 2x10⁶(z+1)²K (where z is the residual charge of the ions, i.e. Z-3). Detailed comparisons for the Υs are made with the results of previous calculations for several ions which span the sequence. The radiation and Auger damping effects were explored for core-excitations along the iso-electronic sequence. Furthermore, we examined the iso-electronic trends of effective collision strengths as a function of temperature.