In this paper, By using R matrix method the electron impact ionization cross sections of atom Mg from near the threshold to 100eV have been calculated in the distorted Coulomb Born no exchange approximation.

• 使用R－矩阵方法，在扭曲库仑－玻恩非交换近似下（DCBNX）采用二态密耦图象，计算了原子镁从电离阈值附近到100eV范围的电子碰撞电离截面。