Electron-Impact Excitations between the n=2 Fine-Structure Levels of Hydrogenic Ions

Abstract

The electron-impact transitions of n=2 fine-structure levels in hydrogenic ions are treated employing two kinds of close coupling methods and the Coulomb–Born approximation. By using these methods together, a reduction of calculation labor is attempted. The obtained results considerably differ from those of a previous close coupling calculation by Zygelman and Dalgarno [Phys. Rev. A 35 (1987) 4085] at low energies.