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The free-free opacity in dense systems is a property that both tests ourfundamental understanding of correlated many-body systems, and is needed tounderstand the radiative properties of high energy-density plasmas. Despite itsimportance, predictive calculations of the free-free opacity remain challengingeven in the condensed matter phase for simple metals. Here we show how thefree-free opacity can be modelled at finite-temperatures via time-dependentdensity functional theory, and illustrate the importance of including localfield corrections, core polarization and self-energy corrections. Ourcalculations for ground-state Al are shown to agree well with experimentalopacity measurements performed on the Artemis laser facility across a widerange of x-ray to ultraviolet wavelengths. We extend our calculations acrossthe melt to the warm-dense matter regime, and find good agreement with advancedplasma models based on inverse bremsstrahlung at temperatures above 10 eV.

Ab-initio simulations and measurements of the free-free opacity in Aluminum