中国物理B ›› 2000, Vol. 9 ›› Issue (12): 892-899.doi: 10.1088/1009-1963/9/12/003

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

ASYMMETRY PARAMETERS AND DIFFERENTIAL CROSS SECTIONS FOR PHOTOIONIZATION-EXCITATION OF HELIUM

江玉海, 孙金锋, 朱遵略, 杨沁玉, 万陵德   

  1. College of Physics and Information Engineering, Henan Normal University, Xinxiang 453002, China
  • 收稿日期:2000-04-07 出版日期:2005-06-10 发布日期:2005-06-10
  • 基金资助:
    Project supported by the Natural Science and Theoretical Education Foundation of Henan Province, China (1999140009).

ASYMMETRY PARAMETERS AND DIFFERENTIAL CROSS SECTIONS FOR PHOTOIONIZATION-EXCITATION OF HELIUM

Jiang Yu-hai (江玉海), Sun Jin-feng (孙金锋), Zhu Zun-lue (朱遵略), Yang Qin-yu (杨沁玉), Wan Ling-de (万陵德)   

  1. College of Physics and Information Engineering, Henan Normal University, Xinxiang 453002, China
  • Received:2000-04-07 Online:2005-06-10 Published:2005-06-10
  • Supported by:
    Project supported by the Natural Science and Theoretical Education Foundation of Henan Province, China (1999140009).

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摘要： Asymmetry parameter β2 for photoionization of helium leaving the He+ ion in the n=2 level and differential cross sections(DCSs) in the n=2,3,4 levels with photon emission angle θ=900 are provided at photon energies 69-76.8 eV employing the R-matrix method with a 20-term target representation, in which five polarization orbitals \bar{6}l are included. The asymmetry parameter β2 and the DCS, in the n=2 level in the region of 69-73 eV, are in good agreement with available experimental and theoretical results. Above the n=3 threshold, we present new theoretical results along with measurements. No theoretical and experimental results can be used to compare with the present calculations of the DCSs for photoionization into the He+ ion in the n=3,4 levels.

Abstract: Asymmetry parameter β2 for photoionization of helium leaving the He+ ion in the n=2 level and differential cross sections(DCSs) in the n=2,3,4 levels with photon emission angle θ=900 are provided at photon energies 69-76.8 eV employing the R-matrix method with a 20-term target representation, in which five polarization orbitals \bar{6}l are included. The asymmetry parameter β2 and the DCS, in the n=2 level in the region of 69-73 eV, are in good agreement with available experimental and theoretical results. Above the n=3 threshold, we present new theoretical results along with measurements. No theoretical and experimental results can be used to compare with the present calculations of the DCSs for photoionization into the He+ ion in the n=3,4 levels.

Key words: Asymmetry parameter, differential cross sections, photoionization, R-matrix

中图分类号:  (Photoionization of atoms and ions)

  • 32.80.Fb
34.50.-s (Scattering of atoms and molecules)