Abstract: The electron impact excitation of He-like ions is studied by distorted wave method. The HFS wave functions of the target are used. We have calculated the transitions between the 1¹S and 2^1,3S, 2^1,3P states for some He-like ions. Results are presented in terms of collision strengths. The incident electron energies are from threshold to x=10. The results are compared with the data avaible. It is shown that the results are satisfied in most cases.

Key words: excitation, collision strength, distorted wave, cross section