中国物理B ›› 2005, Vol. 14 ›› Issue (5): 964-968.doi: 10.1088/1009-1963/14/5/018

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Positron total cross sections for collisions with O2, H2O and CH4 in energy range from 30 to 3000eV

施德恒1, 刘玉芳2, 孙金锋3, 朱遵略3, 杨向东4   

  1. (1)College of Physics & electronic Engineering, Xinyang Normal University, Xinyang 464000,China;Department of Physics, Henan Normal University, Xinxiang 453007, China;Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China; (2)Department of Physics, Henan Normal University, Xinxiang 453007, China; (3)Department of Physics, Henan Normal University, Xinxiang 453007, China;Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China; (4)Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
  • 收稿日期:2004-09-28 修回日期:2004-11-10 出版日期:2005-05-19 发布日期:2005-05-19
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 10174019)

Positron total cross sections for collisions with O2, H2O and CH4 in energy range from 30 to 3000eV

Shi De-Heng (施德恒)abc, Liu Yu-Fang (刘玉芳)b, Sun Jin-Feng (孙金锋)bc, Zhu Zun-Lue (朱遵略)bc, Yang Xiang-Dong (杨向东)c   

  1. a College of Physics & electronic Engineering, Xinyang Normal University, Xinyang 464000, Chinab Department of Physics, Henan Normal University, Xinxiang 453007, Chinab Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
  • Received:2004-09-28 Revised:2004-11-10 Online:2005-05-19 Published:2005-05-19
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 10174019)

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摘要： Total (elastic plus inelastic) cross sections for the scattering of positrons by three molecules (O2, H2O and CH4) in the energy range from 30 to 3000eV are calculated using the additivity rule model at Hartree-Fock level. A complex optical model potential modified by incorporating the concept of bonded atom which takes into consideration the overlapping effect of electron clouds between two atoms in a molecule is firstly employed for the TCS calculation of positron-molecule scattering. The quantitative total cross sections are compared with those obtained in experiments and other theories wherever available, and good agreement is obtained in the energy range from 30 to 3000eV. It is shown that the additivity rule model together with the modified complex optical model potential is completely suitable for the total cross section calculations of the positron-molecule scattering.

关键词: positron scattering, total cross section, additivity rule, atomic and molecular collision

Abstract: Total (elastic plus inelastic) cross sections for the scattering of positrons by three molecules (O2, H2O and CH4) in the energy range from 30 to 3000eV are calculated using the additivity rule model at Hartree-Fock level. A complex optical model potential modified by incorporating the concept of bonded atom which takes into consideration the overlapping effect of electron clouds between two atoms in a molecule is firstly employed for the TCS calculation of positron-molecule scattering. The quantitative total cross sections are compared with those obtained in experiments and other theories wherever available, and good agreement is obtained in the energy range from 30 to 3000eV. It is shown that the additivity rule model together with the modified complex optical model potential is completely suitable for the total cross section calculations of the positron-molecule scattering.

Key words: positron scattering, total cross section, additivity rule, atomic and molecular collision

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  • 3485