Electron-impact ionization of hydrogenic ions is investigated in classical nonideal plasmas. The
projectile–target interaction potential in classical nonideal plasmas is represented by the
pseudopotential model. Semiclassical trajectory method is applied to the path of the projectile
electron in order to visualize the ionization probability as a function of the impact parameter. The
semiclassical ionization probability decreases with increasing the collective effect. It is also found
that the collective effect increases with increasing the projectile energy.