Electron impact optical excitation of helium-like ions in Coulomb-Glauber approximation

The Coulomb-Glauber approximation is applied to evaluate the electron-impact excitation integrated cross sections for 1¹ S —n ¹ P (n=2, 3) transitions in helium-like ions, C⁴⁺, N⁵⁺, O⁶⁺ and Ne⁸⁺. The results are presented in terms of scaled collision strengthn ³ Z ² k _i ² σ and scaled integrated cross-sectionZ ⁴σ. Our values when compared with other available theoretical results are found to be larger than the Coulomb-Born and distorted wave polarised orbital (DWPO) values.