  For the first time, we report a theoretical methodology to predict charge
state distribution of projectile ions inside a solid-target. The method
utilizes either a simple Fermi gas model or an ab initio theoretical method and
a certain parameterization of width for the Lorentzian charge state
distributions. Results obtained from the two approaches are comparable, but the
former has a certain edge over the latter. The projectile charge state
distribution inside a solid-target plays a significant role in estimating
electron capture cross-sections and then to describe the observed K-shell
ionization dynamics. The electron capture process plays a certain role in
L-shell ionization dynamics too, but in a test case of Si on Au target the
subshell charge sharing contributes a more vital role than the electron
capture. Thus, we have validated the present model as a reliable as well as
useful for many solid-target based applications viz. tumour therapy,
biophysics, accelerators, material science etc.
