中国物理B ›› 2009, Vol. 18 ›› Issue (7): 2744-2748.doi: 10.1088/1674-1056/18/7/020

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The effect of dynamical screening on helium (e, 2e) fully differential cross-sections

孙世艳, 贾祥富, 苗向阳, 张均锋, 谢祎, 李雄伟, 师文强   

  1. Institute of Modern Physics, School of Physics and Information Engineering,Shanxi Normal University, Linfen 041004, China
  • 收稿日期:2008-10-21 修回日期:2008-11-20 出版日期:2009-07-20 发布日期:2009-07-20
  • 基金资助:
    Project supported by the Natural Science Foundation of Shanxi Province, China (Grant No 20051008) and the Science Foundation for Returnee of Shanxi Province of China (Grant No 02-16).

The effect of dynamical screening on helium (e, 2e) fully differential cross-sections

Sun Shi-Yan(孙世艳), Jia Xiang-Fu(贾祥富)†, Miao Xiang-Yang(苗向阳), Zhang Jun-Feng(张均锋), Xie Yi(谢祎), Li Xiong-Wei(李雄伟), and Shi Wen-Qiang(师文强)   

  1. Institute of Modern Physics, School of Physics and Information Engineering,Shanxi Normal University, Linfen 041004, China
  • Received:2008-10-21 Revised:2008-11-20 Online:2009-07-20 Published:2009-07-20
  • Supported by:
    Project supported by the Natural Science Foundation of Shanxi Province, China (Grant No 20051008) and the Science Foundation for Returnee of Shanxi Province of China (Grant No 02-16).

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摘要： This paper presents the fully differential cross sections (FDCS) for 102eV electron impact single ionization of helium for both the coplanar and perpendicular plane asymmetric geometries within the framework of dynamically screened three-Coulomb-wave theory. Comparisons are made with the experimental data and those of the three-Coulomb wave function model and second-order distorted-wave Born method. The angular distribution and relative heights of the present FDCS is found to be in very good agreement with the experimental data in the perpendicular plane geometry. It is shown that dynamical screening effects are significant in this geometry. Three-body coupling is expected to be weak in the coplanar geometry, although the precise absolute value of the cross section is still sensitive to the interaction details.

Abstract: This paper presents the fully differential cross sections (FDCS) for 102eV electron impact single ionization of helium for both the coplanar and perpendicular plane asymmetric geometries within the framework of dynamically screened three-Coulomb-wave theory. Comparisons are made with the experimental data and those of the three-Coulomb wave function model and second-order distorted-wave Born method. The angular distribution and relative heights of the present FDCS is found to be in very good agreement with the experimental data in the perpendicular plane geometry. It is shown that dynamical screening effects are significant in this geometry. Three-body coupling is expected to be weak in the coplanar geometry, although the precise absolute value of the cross section is still sensitive to the interaction details.

Key words: fully differential cross sections, screening effects, perpendicular plane geometry

中图分类号:  (Atomic excitation and ionization)

  • 34.80.Dp
31.15.-p (Calculations and mathematical techniques in atomic and molecular physics)