Simulations and diagnostics of high-energy-density plasmas and warm dense matter rely on models of material response properties, both static and dynamic (frequency-dependent). Here, we systematically investigate variations in dynamic electron–ion collision frequencies in warm dense matter using data from a self-consistent-field average-atom model. We show that including the full quantum density of states, strong collisions, and inelastic collisions lead to significant changes in . These changes result in red shifts and broadening of the plasmon peak in the dynamic structure factor, an effect observable in x-ray Thomson scattering spectra, and modify stopping powers around the Bragg peak. These changes improve the agreement of computationally efficient average-atom models with first-principles time-dependent density functional theory in warm dense aluminum, carbon, and deuterium.
Improving dynamic collision frequencies: Impacts on dynamic structure factors and stopping powers in warm dense matter
Thomas W. Hentschel, Alina Kononov, Alexandra Olmstead, Attila Cangi, Andrew D. Baczewski, Stephanie B. Hansen; Improving dynamic collision frequencies: Impacts on dynamic structure factors and stopping powers in warm dense matter. Phys. Plasmas 1 June 2023; 30 (6): 062703. https://doi.org/10.1063/5.0143738
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