正负离子碰撞过程中电荷转移的理论研究

THEORETICAL STUDY OF CHARGE TRANSFER IN POSITIVE NEGATIVE IONS COLLISIONS

文中用渐近方法，采用未微扰的原子波函数，导出了正负离子碰撞过程中，当离子间的距离很大时，入射离子道与出射共价道之间的交换相互作用的解析表达式。利用该相互作用的解析表达式，并考虑在入射通道里Ｈ－离子核外有两个同科电子的情况，由多通道Ｌａｎｄａｕ－Ｚｅｎｅｒ模型分别计算了低能Ｈ＋＋Ｈ－和Ｄ＋＋Ｈ－碰撞过程中的电荷转移总截面。计算结果与已有的实验数据进行了比较。

We obtained an analytical expression of exchange interaction between initial ionic channel and exit covalent channels for positive negative ions collision when the ions are separated by a large distance using an asymptotic method with unperturbed atomic wavefunctions. The expression, in which two equivalent electrons in H - ion are taken into account, is used to calculate total charge transfer(mutual neutralisation) cross sections for H ++H - and D ++H - systems at low collision energy based on multichnnel Landau Zener model. The results obtained are compared with existing experimental data.