Additivity rule for electron-molecule cross section calculation: A geometrical approach

作者：Zecca A^*; Melissa R; Brusa RS; Karwasz GP

来源：Physics Letters, Section A: General, Atomic and Solid State Physics , 1999, 257(1-2): 75-82.

DOI：10.1016/S0375-9601(99)00258-3

A new formulation of the additivity rule is proposed. Here atomic cross sections are added by taking into account the geometrical screening of the component atoms, as seen by the impinging electron. Atomic cross sections are obtained starting from the experimental TCS of simple molecules (H-2, N-2, O-2, CO) via inversion procedure. The model has been successfully applied to the linear molecules NO, N2O, CO2, for energies as low as 50 eV up to 5 keV. A simplified algorithm has been used to evaluate the cross sections of NO2 (a bent molecule) and of CH4: the results underestimate the low energy cross sections.

• 出版日期1999-6-21