裸核离子与中性原子碰撞电离过程的理论研究

基于处理裸核离子与中性原子碰撞电离过程的OBKN和ECPSSR理论模型,系统计算了不同裸核离子与中性原子碰撞K壳层电子俘获截面和直接电离截面,并与其它文献已有的理论和实验结果进行了比较.研究结果表明:碰撞能量较低时,电子俘获截面大于直接电离截面,随着碰撞能量的增加,电子俘获截面和直接电离截面均是先增大后减小且直接电离截面减小地非常缓慢,高能时,直接电离截面大于电子俘获截面.当入射炮弹离子速度接近0.67倍靶原子K壳层电子速度时,电子俘获截面达到最大值,而当入射炮弹离子速度接近靶原子K壳层电子速度时,直接电离截面达到最大值.

Theoretical Study on the Ionization Process from Neutral Atomic K shell Electron Collided by Fully Stripped Ion

Based on the OBKN and ECPSSR theories for calculations of colliding ionization between a bare nucleus ion and a neutral atom, we systematically calculated the electron capture cross section and the direct ionization cross section of the neutral atomic K shell electron collided by a fully stripped ion, and compared with other existing theoretical and experimental data. The results showed that the capture cross section is larger than the direct ionization cross section in low collision energy; with increase of the collision energy, the capture cross section and the direct ionization cross section increases firstly and then decreases, but the direct ionization cross section decreases very slowly, the electron capture cross section reduces rapidly; but in high collision energy, the direct ionization cross section is larger than the capture cross section; when the velocity of the projectile ion is close to 0.67 times of the K shell electron speed of the target atom, the capture cross section arrives a maximum value; when the velocity of the projectile is close to the K shell electron velocity of the target atom, the direct ionization cross section reaches a maximum value.