Study of ion induced Inner Shell Ionization cross section through electron capture mechanism

Abstract

Electron Capture (EC) cross-section from K, L and M shells of the target atoms to the vacant K, L and M shells of the projectile ions have been calculated by deriving the accurate momentum transfer to the captured electrons for different charge states. Several correction factors like polarization correction, relativistic effects (R) of the target wave function, Coulomb-deflection factor (C) due to the effect of the repulsion between the projectile and the target nucleus, correction for projectile energy loss have been introduced. The mean charge state of the projectiles inside the target material has been estimated using suitable empirical models and the fractional charge state distribution has been calculated considering Lorentz distribution. Fractional distribution of charge state of the projectile ions is used to obtain the charge state contributions of the electron capture cross-sections. The effect of Simultaneous Multiple Ionization (SMI) has been considered in the theory of Direct Coulomb Ionization (DCI). The theoretically obtained total cross-sections have been compared with the experimental findings obtained from various literature. The computation scheme has been depicted through sample calculations of ionization cross-sections through electron capture mechanism.