Additivity rule for electron-molecule total cross section calculations at 50-5000 eV: A geometrical approach

作者：Shi De Heng^*; Sun Jin Feng; Ma Heng; Zhu Zun Lue; Yang Xiang Dong

来源：Chinese Physics Letters, 2007, 24(10): 2819-2822.

To quantify the changes of the geometric shielding effect in a molecule as the incident electron energy varies, we present an empirical fraction, which represents the total cross section (TCS) contributions of shielded atoms in a molecule at different energies. Using this empirical fraction, a new formulation of the additivity rule is proposed. Using this new additivity rule, the TCSs for electron scattering by CO2, C2H2, C6H12 (cyclo-hexane) and CsHjr, (cyclo-octane) are calculated in the range 50-5000 eV. Here the atomic cross sections are derived from the experimental TCS results of simple molecules (H-2, O-2, CO). The quantitative TCSs are compared with those obtained by experiments and other theories, and good agreement is attained over a wide energy range.

• 出版日期2007-10
• 单位河南师范大学