He原子的低能（e,2e）过程中的极化和关联效应

摘要

The Distorted Wave Born Approximation was modified with polarization and post-collisional interaction,which has been used to calculate the triple differential cross sections for electron impact ionization of helium in coplanar asymmetric geometry at incident energy of 50eV.The calculated results are compared with available experimental data.It is noted that the post-collisional interaction and polarization effect play an important role in the low-energy（e,2e） processes of He in coplanar asymmetric geometry.%用包含后碰撞作用和极化效应的扭曲波玻恩近似理论计算了共面不对称几何条件下入射电子能量为50eV时He原子的低能（e,2e）反应的三重微分截面,并同实验测量结果进行了比较。指出后碰撞作用和极化效应在共面不对称几何条件下He原子的低能（e,2e）过程中均起着重要的作用。