Abstract
Theoretical determination of electron impact total ionization cross sections for chloromethane (CH2Cl2, CHCl3), bromomethane (CH2Br2, CHBr3, and CBr4) and some mono chloroalkane (C2H5Cl, 1-C3H7Cl and 1-C4H9Cl) molecules in gaseous ground state are reported over the energy range from ionization threshold to 5keV. Here, the target molecule is represented as an aggregate of scattering centres, which is assumed to scatter the electron independently. Hence, an approximation called group additivity rule is adopted for the determination of cross sections. Spherical complex optical potential formalism is employed to calculate the inelastic cross section for the constituent scattering centres. Sum of the inelastic cross sections of the constituent centres gives the molecular total inelastic cross section. Further, the total ionization cross section of the target molecule is derived from the molecular inelastic cross section using the complex scattering potential ionization contribution method. The results obtained are compared with previous measurements and theoretical values wherever available and satisfactorily good agreement is observed. The cross section predicted presently for CBr4 molecule is a maiden attempt.
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