类锂离子与He原子碰撞中的单电子丢失

Single-electron Loss in Collision of Lithium-like Ion With He Atom

本文基于 Bohr-Lindhard （B-L ）模型，考虑了碰撞双方的电子密度分布，计算了能量为20-900 keV/u的B2＋、C3＋、N4＋及O5＋等类锂离子与He原子碰撞中的单电子丢失（SEL ）、伴随单电离的单电子丢失（SELSI）、伴随双电离的单电子丢失（SELDI）等截面对能量的依赖曲线，计算结果与已有的实验数据符合较好。分析发现，对于一给定的过程，较重的离子有较小的有效碰撞参数范围；对于同一种入射离子，SEL、SELSI和SELDI等过程对应的有效碰撞参数范围依次减小。

The cross sections for single-electron loss （SEL） ,single-electron loss associ-ated with single ionization （SELSI ） and single-electron loss associated with double ionization （SELDI） in collisions of lithium-like ions B2＋ ,C3＋ ,N4＋ and O5＋ with helium atom in the energy range from 20 to 900 keV/u were calculated by considering the distri-bution of both target and projectile electrons based on the Bohr-Lindhard （B-L） model . The calculated results were compared with the available experimental data .The analysis show s that the heavier the ion ,the smaller the impact parameter for a given process and the impact parameters for SEL ,SELSI and SELDI decrease successively for a given ion .