Electron Impact Ionization Cross Section- Semi-empirical approach

Abstract

This review pertains to the various semi-empirical methods used to calculate collision cross-section of atomic particles (from mono to polyatomic particles having mass from 1 amu to about 120 amu) by electron impact ionization process have been discussed. The semi-empirical methods mostly used for finding the precise cross section data theoretically, where experimental data is not available and/or have limited data. Moreover, the paper describes advancement of these methods for calculating cross-section for complex molecules also. Some remarkable applications in applied sciences are also discussed. The paper discusses the various theoretical formalisms used by different authors with different parameters such as Born Approximation, Binary Encounter Bethe, R–matrix method, Spherical complex optical potential and among others. Those were improved time to time for the better result to determine total cross-section data.