强磁场下He2++H(1s)的碰撞电离微分截面及电离机理研究

丁丁; 何斌; 屈世显; 王建国

doi:10.7498/aps.62.033401

摘要

应用经典径迹蒙特卡罗方法详细研究了强磁场环境下He2++H (1s)的重粒子碰撞电离过程. 首先得到了在不同强度的纵向和横向磁场下电离电子的一阶能量微分截面, 发现它们不仅在数值上比未加磁场下的结果有明显的增加, 而且随电离电子的能量变化不再是单调下降, 而是呈现一定的峰值结构. 通过对电离事例的分析, 解释了这些变化形成的原因. 其次由于强磁场会导致碰撞电离的物理机理有很大变化, 因此也分析并解释了磁场强度、方向及入射粒子能量等因素对电离机理的影响行为.

关键词:

Abstract

The ionization processes in collisions of H (1s) atoms with He2+ are studied by the classical trajectory Monte Carlo method. The first-order differential cross sections for ionization are calculated for different field strengths of both transverse and parallel magnetic field, and they increase obviously with the fields applied. Instead of monotonic decline, a peak appears for the differential cross section, with the fields applied. According to the analysis of trajectories, the ionization mechanisms become quite different. In this paper, the influences the strength and direction of the applied field including the incident energy on the ionization mechanisms are also explained.

Keywords:

heavy-particle collision /
classical trajectory Monte Carlo method /
strong magnetic field /
impact ionization

作者及机构信息

1.
陕西师范大学物理学与信息技术学院, 理论与计算物理研究所, 西安 710062;

2.
北京应用物理与计算数学研究所高能量密度物性数据中心, 北京 100088

基金项目: 国家自然科学基金委员会与中国工程物理研究院联合基金(批准号: 10976016) 和国家自然科学基金(批准号: 11025417, 10974021, 10979007, 11104017)资助的课题

Authors and contacts

1.
Institute of Theoretical and Computational Physics, School of Physics and Information Technology, Shannxi Normal University, Xi'an 710062, China;

2.
Institute o f Applied Physics and Computational Mathematics, Beijing 100088, China

Funds: Project supported by NSAF (Grant No. 10976016), the National Natural Science Foundation of China (Grant Nos. 11025417, 10974021, 10979007, 11104017).

参考文献

[1]	Stolterholt N 1997 Electron Emission in Heavy Ion-Stom Collisions (Heidelberg: Springer-Verlag Press)
[2]	Grosdanov T P, McDowell M R C 1985 J. Phys. B 18 921
[3]	Bradenbrink S, Sidky E Y, Roller-Lutz Z, Lutz H O 1997 J. Phys. B 30 L161
[4]	Bradenbrink S, Sidky E Y, Roller-Lutz Z, Reihl H, Lutz H O 1997 Phys. Rev. A 55 4290
[5]	Bradenbrink S, Reihl H, Roller-Lutz Z, Lutz H O 1997 J. Phys. B 30 5819
[6]	He B, Wang J G, Janev R K 2009 Phys. Rev. A 79 012706
[7]	Zhang H, Wang J G, He B, Qiu Y B, Janev R K 2007 Phys. Plasmas 14 053505
[8]	Liu L, Wang J G, Janev R K 2008 Phys. Rev. A 77 042712
[9]	Ding D, He B, Liu L, Zhang C H, Wang J G 2009 Acta Phys. Sin. 58 8419 (in Chinese) [丁丁, 何斌, 刘玲, 张程华, 王建国 2009 物理学报 58 8419]
[10]	Luka S, Fabio S 1997 J. Phys. B 29 751
[11]	Lu Z Z, Chen D Y, Fan R W, Xia Y Q 2012 Appl. Phys. Lett. 100 014105
[12]	Kirchner T 2004 Phys. Rev. A 69 063412
[13]	Montanari C C, Montenegro E C, Miraglia J E 2012 J. Phys. B 45 105201
[14]	Pinzola M S, Lee T G, Colgan J 2011 J. Phys. B 44 205204
[15]	Abrines R, Percival I C 1966 Proc. Phys. Soc. London 88 861
[16]	Ning F F, He J F, Zeng S L, Zou S Y, Yan J 2011 Acta Phys. Sin. 60 043201 (in Chinese) [倪飞飞, 何建锋, 曾思良, 邹士阳, 颜君 2011 物理学报 60 043201]
[17]	Jackson J D 1975 Classical Electrodynamics (Chapter 13) (New York: John Wiley press)

施引文献

[1]	Stolterholt N 1997 Electron Emission in Heavy Ion-Stom Collisions (Heidelberg: Springer-Verlag Press)
[2]	Grosdanov T P, McDowell M R C 1985 J. Phys. B 18 921
[3]	Bradenbrink S, Sidky E Y, Roller-Lutz Z, Lutz H O 1997 J. Phys. B 30 L161
[4]	Bradenbrink S, Sidky E Y, Roller-Lutz Z, Reihl H, Lutz H O 1997 Phys. Rev. A 55 4290
[5]	Bradenbrink S, Reihl H, Roller-Lutz Z, Lutz H O 1997 J. Phys. B 30 5819
[6]	He B, Wang J G, Janev R K 2009 Phys. Rev. A 79 012706
[7]	Zhang H, Wang J G, He B, Qiu Y B, Janev R K 2007 Phys. Plasmas 14 053505
[8]	Liu L, Wang J G, Janev R K 2008 Phys. Rev. A 77 042712
[9]	Ding D, He B, Liu L, Zhang C H, Wang J G 2009 Acta Phys. Sin. 58 8419 (in Chinese) [丁丁, 何斌, 刘玲, 张程华, 王建国 2009 物理学报 58 8419]
[10]	Luka S, Fabio S 1997 J. Phys. B 29 751
[11]	Lu Z Z, Chen D Y, Fan R W, Xia Y Q 2012 Appl. Phys. Lett. 100 014105
[12]	Kirchner T 2004 Phys. Rev. A 69 063412
[13]	Montanari C C, Montenegro E C, Miraglia J E 2012 J. Phys. B 45 105201
[14]	Pinzola M S, Lee T G, Colgan J 2011 J. Phys. B 44 205204
[15]	Abrines R, Percival I C 1966 Proc. Phys. Soc. London 88 861
[16]	Ning F F, He J F, Zeng S L, Zou S Y, Yan J 2011 Acta Phys. Sin. 60 043201 (in Chinese) [倪飞飞, 何建锋, 曾思良, 邹士阳, 颜君 2011 物理学报 60 043201]
[17]	Jackson J D 1975 Classical Electrodynamics (Chapter 13) (New York: John Wiley press)

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