We have carried-out parallel intermediate-coupling frame transformation R-matrix calculations for electron-impact excitation amongst the 204 close-coupling levels of the 2sx 2p y (x + y = 3), 2s 2 {3, 4}l, 2s2p{3, 4}l, and 2p 2 3l configurations for all boron-like ions from C + to Kr 31+ . We have also included the configuration interaction due to the 2p 2 4l, 2s3l3l and 2p3s3l configurations. A detailed comparison has been made of the target structure and excitation data for four specific ions (viz., Ne 5+ , Ar 13+ , Fe 21+ and Kr 31+ ) that span the sequence, so as to assess the accuracy over the entire sequence. Effective collision strengths (Υs) are presented at temperatures ranging from 2 × 10 2 (z + 1) 2 K to 2 × 10 6 (z + 1) 2 K (where z is the residual charge of the ions, i.e. Z − 5). Detailed comparisons for the (effective) collision strengths (Υs) Ω are made with the results of previous calculations for the four representative ions. Furthermore, we examine the iso-electronic trends of the effective collision strengths as a function of temperature.

We present results for the electron-impact excitation of all Ne-like ions from Na + to Kr 26+ obtained using the intermediate-coupling frame transformation R-matrix approach. For each ion's calculation, the close-coupling expansion is taken to be the 113 LS terms (209 levels) belonging to the configurations [1s 2 ]2s 2 2p 6 , 2s 2 2p 5 {3, 4, 5}l, 2s2p 6 {3, 4, 5}l (l ∈ s, p, d, f, and g), and 2s 2 2p 5 {6, 7}l (l ∈ s, p, and d). An additional configuration interaction effect arising from configurations of 2s 2 2p 4 3l{3, 4, 5}l (l ∈ s, p, d, f and g) was included in the target expansion. A detailed comparison of the target structure has been made for six specific ions (Si 4+ , Ar 8+ , Ca 10+ , Fe 16+ , Ni 18+ , and Kr 26+ ) spanning the sequence to assess the accuracy for the entire sequence. Effective collision strengths (Υs) are presented at temperatures ranging from 2×10 2 (q+1) 2 K to 2×10 6 (q+1) 2 K (where q is the residual charge of ions, i.e. Z −10). Detailed comparisons for the Υs are made with the results of previous calculations for several ions, which span the sequence. Furthermore, we examine the iso-electronic trends of effective collision strengths as a function of temperature. The present results are the only R-matrix ones for the majority of the ions and the most extensive and complete data for modelling to-date.

We present results for the outer-shell electron-impact excitation of all Na-like ions from Mg + to Kr 25+ obtained using the intermediatecoupling frame transformation R-matrix approach. For each ion's calculation, the target and close-coupling expansions are both taken to be the 18 LS terms (32 levels) belonging to configurations [1s 2 2s 2 2p 6 ]3l, 4l, 5l and 6l (l = 0−5). Effective collision strengths (Υs) are presented at temperatures ranging from 2 × 10 2 (q + 1) 2 K to 2 × 10 6 (q + 1) 2 K (where q is the residual charge of ions, i.e. Z − 11). Detailed comparisons for the Υs are made with the results of previous calculations for several ions, which span the sequence. Furthermore, we examine the iso-electronic trends of both low-and high-temperature effective collision strengths

We present results for the electron-impact excitation of all Li-like ions from Be + to Kr 33+ 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 1s 2 5l and 1s2l4l levels, respectively. A detailed comparison of the target structure and collision data has been made for four specific ions (O 5+ , Ar 15+ , Fe 23+ and Kr 33+ ) spanning the sequence so as to assess the accuracy for the entire sequence. Effective collision strengths (Υs) are presented at temperatures ranging from 2 × 10 2 (z + 1) 2 K to 2 × 10 6 (z + 1) 2 K (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.