Abstract
A method is suggested to obtain the collisional parameter C i for different types of ions produced in the dissociative ionization of a molecule by electron impact from C T, the collisional parameter appropriate to the sum of direct and dissociative ionization cross-sections. These C i values are then used with the semi-empirical approach of Jain and Khare to obtain ionization cross-sections for the production of NH 2 +, NH +, OH +, H + and O + ions. The theoretical cross-sections, with the exception of those for H + ions, are found to be in satisfactory agreement with the experimental data. The method proposed here is an improvement over earlier work where C i was chosen to be C T for all values of i.
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