The electron-impact ionization cross sections for H-like ions He,C,Ne,Si,Ca and F e were calculated with the distorted wave Born exchange approximation. The results were compared with the S.M.

• 在扭曲波库仑玻恩交换似近下用编制的计算程序计算了类氢离子He，C，Ne，Si，Ca，Fe的电子碰撞电离截面，并将结果与Younger的扭曲波结果作了比较。