Cross sections for the resonance transitions in Mg II, Zn II and Cd II: a distorted-wave approach

Abstract
Differential cross sections have been calculated using the distorted-wave (DW) approximation for the electron impact resonance transitions in Mg II, Zn II and Cd II in the intermediate energy region 15-100 eV. Appropriate static potentials of initial and final states have been used for distorting the incident and scattered projectile electron waves, respectively. The present results are compared with the only available close-coupling (CC) calculations and experimental results. Total cross sections are also obtained and briefly discussed. The method is also extended to similar positron impact calculations.