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| Total cross sections for electrons scattering from C_2F_4 and SO_2 at 30-5000 eV: considering the geometric shielding effect | |
| 作者姓名： | 施德恒 孙金锋 刘玉芳 朱遵略 杨向东 |
| 作者单位： | College of Physics & Electronic Engineering Xinyang Normal University Xinyang 464000 College of Physics & Information Engineering，Henan Normal University，Xinxiang 453007，College of Physics & Information Engineering Henan Normal University，Xinxiang 453007 Institute of Atomic and Molecular Physics，Sichuan University，Chengdu 610065，College of Physics & Information Engineering Henan Normal University，Xinxiang 453007，College of Physics & Information Engineering Henan Normal University，Xinxiang 453007 Institute of Atomic and Molecular Physics，Sichuan University，Chengdu 610065，Institute of Atomic and Molecular Physics Sichuan University，Chengdu 610065 |
| 基金项目： | This work was supported by the National Natural Science Foundation of China under Grant No. 10574039. |
| 摘 要： | Considering the changes of the geometric shielding effect in a molecule as the incident electron energy varing, an empirical fraction, which is dependent on the incident electron energy, is presented. Using this empirical fraction, the total cross sections (TCSs) for electrons scattering from complex polyatomic molecules C2F4 and SO2 are calculated over a wide energy range from 30 to 5000 eV together with the additivity rule model at Hartree-Fock level. In the TCS calculations, the atoms are presented by the spherical complex optical potential, which is composed of static, exchange, polarization and absorption contributions. The quantitative TCSs above 100 eV are in good agreement with those obtained by experiments and other theories. It is proved that the empirical fraction, which exhibits the TCS contributions of shielded atoms in a molecule at different energies, is reasonable. |
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