利用加速器提供的非全裸重离子束 (q=1-4) 轰击氦、氖和氩原子,研究了由非全裸离子引起原子多重电离的有效电荷效应和电荷交换效应. 提出用一个有效电荷来等价描述非全裸入射离子对靶原子的作用,将描述全裸离子-原子碰撞过程的物理模型推广到处理非全裸离子-原子碰撞过程,采用轨道贯穿模型对有效电荷的内在物理机制进行了解释,提出一种新的理论方法将多重电离中俄歇过程的贡献予以扣除. 通过研究发现,扣除俄歇过程贡献后,多重电离截面随入射离子q/v的变化与多步过程的预言相符.
参考文献
[1] | McGuire J H. Multiple-electron Ex citation, Ionization and Transfer in High- velocity Atomic and Molecular Collisions [J]. Adv Atom Mol Opt Phys, 1992, 29 : 217-323. |
[2] | 蔡晓红. 离子-原子碰撞中的多重电离研究 [D], 兰州: 兰州大学现代物理系, 1995, 1-117. |
[3] | McGuire J H, Weaver L. Independent Electron Approxima tion for Atomic Scattering by Heavy Particles [J]. Phys Rev, 1977, A16: 41-4 7. |
[4] | Dubois R D, Toburen L H. Single and Double Ionization of Helium by Neutral-particle to Fully Stripped Ion Impact [J]. Phys Rev, 1988, A38: 3 96 0-3 968. |
[5] | Manson S T, Dubois R D, Toburen L H. Multiple-ionizat ion Mechanisms in Fa st Proton-neon Collisions [J]. Phys Rev Lett, 1983, 51: 1 542-1 545. |
[6] | Cai X, Liu Zhaoyuan, Chen Ximeng et al. Effective C harge Effect in 2.0-7.0 MeV Partially Stripped Fq+-helium Collisions [J]. Austr J Phys, 19 96, 49: 945-951. |
[7] | Cai X, Chen Ximeng, Shen Ziyong et al. The Effectiv e Charge Effect in Partially Stripped Ion-helium Collisions [J]. Z Phys, 19 96, A355: 439-442. |
[8] | Cai X, Chen Ximeng, Shen Ziyong et al. The Investi gation of the Multiple Ionization of Argon by Energetic Oxygen Ions [J]. Nucl Instr & Meth, 1996, B119: 452-456. |
[9] | Cai X, Chen Ximeng, Shen Ziyong et al. The Ionizat ion of Helium by 1.5-7.5 MeV Partially Stripped Cq+-ions [J]. Nucl Instr & Meth, 1996, B114: 208-212. |
[10] | Cai X, Chen Ximeng, Shen Ziyong et al. The Double Ionization of Helium by 1.5-7.5 MeV Partially Stripped Fluorine Ions [J]. Ch in J Nucl Phys, 1996, 18: 98-101. |
[11] | Cai X, Shen Ziyong, Chen Ximeng et al. Double Ioni zation of Helium by Partially Stripped Oxygen Ions [J]. Chin Phys Lett, 1996, 13: 428-431. |
[12] | Cai X, Liu Zhaoyuan, Chen Ximeng et al. One and Tw o Electron Transitions in Energetic Ion and Helium Collisions [J]. Nucl Instr & Meth, 1998, B140: 31 9-324. |
[13] | Cai X, Chen X, Liu Z et al. Multi-electron Transi tions in Fq+-Ne and Naq+-Ne Collisions [J]. The Europea n Physical Journal , 1999, D6: 23-28. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分:
-
10%
-
20%
-
30%
-
40%
-
50%