The effect of dynamical screening on helium （e, 2e） fully differential cross-sections

This paper presents the fully differential cross sections (FDCS) for 102eV electron impact single ionization of helium for both the coplanar and perpendicular plane asymmetric geometries within the framework of dynamically screened three-Coulomb-wave theory. Comparisons are made with the experimental data and those of the three-Coulomb wave function model and second-order distorted-wave Born method. The angular distribution and relative heights of the present FDCS is found to be in very good agreement with the experimental data in the perpendicular plane geometry. It is shown that dynamical screening effects are significant in this geometry. Three-body coupling is expected to be weak in the coplanar geometry, although the precise absolute value of the cross section is still sensitive to the interaction details.     

非共面几何条件下102eV电子碰撞He原子电离的全微分截面

利用DS3C模型研究了非共面几何(垂直平面与垂直动量转移平面)条件下,散射电子的散射角θ₁取不同固定值时,102eV的电子碰撞He原子单电离反应过程的完全微分截面(FDCS),将其计算结果与3C,CCC等理论模型及实验数据进行了比较.结果表明DS3C模型能够较好地定性描述非共面几何(垂直平面与垂直动量转移平面)条件下的碰撞结果,说明对于非共面几何条件下的碰撞过程,出射道三粒子间的动力学关联效应是比较强的. 关键词： 非共面几何 单电离 全微分截面