One-electron model of the high-frequency dielectric function of dense plasmas

The approach is developed to calculate reflectivity and high-frequency dielectric permeability of dense plasmas. The Kubo-Greenwood formula is applied. One-electron wave functions are used. Plane waves are substituted for the wave functions of the free states. Hydrogen-like wave functions are substituted for the wave functions of the bound states. The restriction of the excited pair bound states is included in the approach. Calculations are performed for the shock-compressed xenon. The results are in the fair agreement with the experimental data for densities ρ > 2 g/cm³ whereas the remarkable discrepancy appears at low densities. The discrepancy can be attributed to a finite width of the shock front. The width increases with the decrease of density and can contribute to the reflectivity at low densities. (paper)