Modified binary encounter model for proton impact K-shell ionisation of atoms

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Abstract
The Coulomb deflection of a projectile due to the target nucleus and the increase in the binding of a target electron due to incident protons have been incorporated in a binary encounter model for proton impact K-shell ionisation of atoms. The modified expressions have been used to calculate K-shell ionisation cross sections for different atomic systems. The cross sections have also been calculated by using Vriens' expression (1966, 1967) with a Hartree-Fock velocity distribution for the bound electron. These results have been compared with other theoretical calculations for the bound electron. These results have been compared with other theoretical calculations and the available experimental data. The modified model gives good results for the ionisation cross sections for low-energy protons and results based on Vriens' expression using the Hartree-Fock velocity distribution agree well with the experimental results at high incident energies.