1. Additivity Rule for Electron-Molecule Total Cross Section Calculations at 50-5000 eV: A Geometrical Approach.
- Author
-
Shi De, Sun Jin, Ma Heng, Zhu Zun, Lue and, and Yang Xiang
- Subjects
NUCLEAR cross sections ,ELECTRON scattering ,GEOMETRY ,ADDITION (Mathematics) - Abstract
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 C8H16 (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 (H2, O2, CO). The quantitative TCSs are compared with those obtained by experiments and other theories, and good agreement is attained over a wide energy range. [ABSTRACT FROM AUTHOR]
- Published
- 2007
- Full Text
- View/download PDF