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

摘要: 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。

Abstract: The cross sections for single-electron loss (SEL), single-electron loss associated 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 distribution 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 shows 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.