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Plasma screening effect on the differential cross sections of collision ionization of H by He2+

He Bin Liu Ling Wang Jian-Guo Ding Ding Zhang Cheng-Hua

Plasma screening effect on the differential cross sections of collision ionization of H by He2+

He Bin, Liu Ling, Wang Jian-Guo, Ding Ding, Zhang Cheng-Hua
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  • Received Date:  19 January 2009
  • Accepted Date:  11 February 2009
  • Published Online:  20 December 2009

Plasma screening effect on the differential cross sections of collision ionization of H by He2+

  • 1. (1)北京应用物理与计算数学研究所,北京 100088; (2)北京应用物理与计算数学研究所,北京 100088;辽宁大学物理学院,沈阳 110036; (3)辽宁大学物理学院,沈阳 110036

Abstract: A classical trajectory Monte Carlo method is used to investigate the collision ionization of H by He2+ in Debye plasma, and the total and differential cross sections are obtained for collision energies of 5—400 keV/u in a large plasma parameter range. The interaction between charged particles is described by the Debye-Hückel model. Plasma screening changes the ionization energy and classical microcanonical distribution of bound electrons and the interaction between electron and the projectile, which result in the modification of ionization cross sections. It is found that both the total and differential cross sections increase with the increasing of screening interaction, and especially for energies below 10 keV/u, the cross sections are one to two magnitudes larger than those in the unscreened case. The emitted electron moves to the higher energy range, and the binary-encounter ionization mechanism becomes more important and a new hump appears due to the screening effect. Our unscreened cross section is in a good agreement with the experimental measurement for collision energies beyond 70 keV/u.

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