正电子碰撞氦原子电离截面的理论研究

Theoretical Study on Lonization Cross Section of Positive Electron Impact Helium Atom

文中运用具有耦合通道靶函数的新库仑扭曲波方法用来计算正电子碰撞氦原子电离截面.除此之外,还采用的类氢原子的Slater轨道波函数来描述氦原子的初态波函数.入射电子的能量在电离阈值和500a.u之间变化.理论计算结果与实验数据和其他理论计算结果符合较好.而且与其他复杂的畸变波方法相比,文中的理论模型更容易实现,并能给出更为准确的结果.

The new Coulomb twisted wave method with coupling channel target function is used to calculate the ionization cross section of the positron impact helium atom. In addition,the Slater orbital wave function of the hydrogen atom is used to describe the initial wave function of the helium atom. The energy of the incident electrons varies between the ionization threshold and 500 a. u. The theoretical results are in good agreement with the experimental data and other theoretical results. Moreover, compared with other complex distorted wave methods, the theoretical model in the text is easier to implement and gives more accurate results.