Investigation of dominant states in the collisions of Ar VII and Kr XXIV with H2 and He targets

In thermal plasma, the ion–atom collisions proceed most probably through resonance processes. One of the important processes is the resonant transfer excitation followed by emission of X-rays (RTEX), which causes self-cooling for plasma. In addition, it is identical to the dielectronic recombination (DR) in electron–ion collisions. The present work deals with the calculation of DR cross-sections (σDRs) and DR rate coefficients (αDRs) as well as RTEX cross-sections (σRTEX s) for Mg-like ions [Ar6+ and Kr24+ ] with L-shell and K-shell excitation for Δn = 0 and Δn = 0. Comparison between the present results and other calculations for the rates are presented. RTEX cross-sections are calculated for the collision of Ar6+ and Kr24+ ions with He and H2 targets. The calculations are carried out using the adapted angular momentum average scheme in the isolated resonance approximation.