中国物理B ›› 1999, Vol. 8 ›› Issue (5): 331-341.doi: 10.1088/1004-423X/8/5/003

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ELECTRON IMPACT IONIZATION OF HELIUM FROM ITS GROUND AND METASTABLE STATES

陈长进1, 徐克尊2   

  1. (1)Department of Physics, Anhui University, Hefei 230039, China; Laboratory of Electron Collision Spectroscopy, University of Science and Technology of China, Hefei 230027, China; (2)Laboratory of Electron Collision Spectroscopy, University of Science and Technology of China, Hefei 230027, China
  • 收稿日期:1998-11-09 出版日期:1999-05-15 发布日期:1999-05-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 19634040) and by the Education Foundation of Anhui Province (Grant No. 97JL101), China.

ELECTRON IMPACT IONIZATION OF HELIUM FROM ITS GROUND AND METASTABLE STATES

Chen Zhang-jin (陈长进)ab, Xu Ke-zun (徐克尊)b   

  1. a Department of Physics, Anhui University, Hefei 230039, China; b Laboratory of Electron Collision Spectroscopy, University of Science and Technology of China, Hefei 230027, China
  • Received:1998-11-09 Online:1999-05-15 Published:1999-05-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 19634040) and by the Education Foundation of Anhui Province (Grant No. 97JL101), China.

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摘要： The triple differential cross sections for the ionization of helium from its ground state 11S and metastable states 21S and 23S in coplanar asymmetric geometry by 150, 250 and 400 eV electrons have been calculated in the BBK model. The present results are compared with the experimental data and/or the other theoretical ones. It has been found that the structures for the metastable states differ markedly from those for the ground state. The collision mechanisms for the new structures appearing in the cross sections for the ionization from metastable states have been analysed. And it has been shown how the intensity of recoil peak changes due to the size of the electron orbital. In addition, the optimal kinematical situations for the cross sections are explored for future experiment.

Abstract: The triple differential cross sections for the ionization of helium from its ground state 11S and metastable states 21S and 23S in coplanar asymmetric geometry by 150, 250 and 400 eV electrons have been calculated in the BBK model. The present results are compared with the experimental data and/or the other theoretical ones. It has been found that the structures for the metastable states differ markedly from those for the ground state. The collision mechanisms for the new structures appearing in the cross sections for the ionization from metastable states have been analysed. And it has been shown how the intensity of recoil peak changes due to the size of the electron orbital. In addition, the optimal kinematical situations for the cross sections are explored for future experiment.

中图分类号:  (Atomic excitation and ionization)

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