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Improving dynamic collision frequencies: Impacts on dynamic structure factors and stopping powers in warm dense matter

Physics of Plasmas

Hansen, Stephanie B.; Hentschel, Thomas W.; Kononov, Alina K.; Olmstead, Alexandra; Baczewski, Andrew D.; Cangi, Attila

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.

More Details
TYPE Journal Article YEAR 2023
DOIOSTIScopus
Results 2726–2750 of 99,299
Results 2726–2750 of 99,299