RELATIVISTIC STUDY OF ELECTRON-IMPACT EXCITATION OF HYDROGEN-LIKE IONS

Electron scattering from hydrogen-like He+, Fe25+ and U91+ ions has be en studied using the R-matrix method with non-relativistic and relativ istic approximations. The case of transitions 1s-2s and 1s-2p as well as transitions between fine structure n = 2 levels was considered. Col lision strengths have been calculated for the energy range from the n = 2 excitation threshold to the ionization threshold. Effective collis ion strengths obtained by integrating collision strengths over Maxwell ian distribution of electron velocities were compared with results of other calculations.