Experimental data of inner-shell ionization cross sections and outer-shell
ionization probabilities per electron, obtained for the collision system. C
u + Bi in the energy range of 0.1-1.625 MeV/u, are in good agreement with t
he predictions of the statistical model of Mittleman and Wilets. The found
dependence of the diffusion constant determined for different final vacancy
states on the excitation (ionization) energy is in fair agreement with the
model prediction.