Density effect for the ionization loss of charged particles in various substances

The density-effect correction $\delta \left(\beta \right)$ for the ionization energy loss of charged particles has been evaluated for 72 substances (34 metallic elements, 26 compounds, 11 gases, and liquid hydrogen), using up-to-date values of the mean excitation potential $I$ and of the atomic absorption edges $h{\nu }_i$, which were employed as input data for the general equations for $\delta \left(\beta \right)$ previously derived by Sternheimer.