高电荷态Xe离子与He原子碰撞中的电子转移过程研究

Study of the electron transfer in Xe^(q+)-He collisions

采用位置灵敏探测和飞行时间技术研究了高电荷态Xe离子 (q =1 5 ,1 7,1 9,2 1 ,2 3)与He原子碰撞中双电子转移截面与单电子转移截面比随入射离子电荷态的变化规律 .提出一步过程假定 ,对扩展的经典过垒 (ECB)模型进行了修正 ,利用修正模型计算得到的单、双电子转移绝对截面与Andersson等人和Selberg等人的实验结果很好符合 。

The cross section ratios of the double to single electron transfer of helium target induced by Xe q + ( q= 15,17,19,21,23) ions are measured by means of the position sensitive and time of flight techniques. By considering an one step transfer mechanism, we modify the extended classical over barrier model. It is found that the calculated single and double electron transfer cross sections using the modified model show excellent agreement with the experimental data of Andersson et al . and Selberg et al , and improves the agreement with the present measured double to single electron transfer ratio considerably.