Improving dynamic collision frequencies: Impacts on dynamic structure factors and stopping powers in warm dense matter
Improving dynamic collision frequencies: Impacts on dynamic structure factors and stopping powers in warm dense matter
Hentschel, T. W.; Kononov, A.; Olmstead, A.; Cangi, A.; Baczewski, A. D.; Hansen, S. B.
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 ν(ω) 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 ν(ω) . 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.
Keywords: Matter under extreme conditions; High-energy density science; Density functional theory; Time-dependent density functional theory; Average-atom models; Warm dense matter; Collision frequencies; X-ray Thomson scattering
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Physics of Plasmas 30(2023), 062703
Online First (2023) DOI: 10.1063/5.0143738
Cited 3 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-37074