  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.
