用反应窗理论研究离子与原子碰撞的态选择微分截面

State-selective differential cross sections in ion-atom collisions studied by reaction window theory

基于描述低能离子与原子碰撞的分子库仑过垒模型,详细阐述了与入射离子速度相关的反应窗理论,并对影响势垒变化的平均径向速度做了修正.根据该理论,计算了C5+-He和He2+-He碰撞体系单电子俘获过程的态选择微分截面,并分别与Kamber等人和Mergel等人的实验结果进行了比较.

Based on the Molecular Coulombic over Barrier Model （MCBM） used in classical description of slow ion-atom oollisions, the theory of reaction window related to projectile velocity is presented in detail with some modifications to the average radial velocity which affects the changes of the Coulombic barrier between the projectile and the target. The state-selective differential cross sections of single electron capture process in C^5＋ -He and He^2＋ -He collisions are calculated according to the theory, and are compared with the experimental data of E Y Kamber et al. （Phys. Rev. A, 1999,60：2907 - 2916） and V Mergel et al. （Nucl. Instr. and Meth. in Phys. Res. B, 1995,98： 593 - 596）, respectively.