Influence of local-field corrections on Thomson scattering in collision-dominated two-component plasmas

Abstract

Thomson scattering in non-ideal (collision-dominated) two-component plasmas is calculated accounting for electron-ion collisions as well as electron-electron correlations. This is achieved by using a novel interpolation scheme for the electron-electron response function generalizing the traditional Mermin approach. Also, ions are treated as randomly distributed inert scattering centers. The collision frequency is taken as a dynamic and complex quantity and is calculated from a microscopic quantum-statistical approach. Implications due to different approximations for the electron-electron correlation, i.e. different forms of the OCP local field correction, are discussed.

Warm Dense Matter Demonstrating Non-Drude Conductivity from Observations of Nonlinear Plasmon Damping

“…Previous studies [22,43,65] calculated the plasmon damping via the Mermin approximation together with static local field corrections [66,67] (MA) applying collision frequencies based on perturbative approximations [39,44,68]. Especially in strongly correlated systems, this analysis cannot provide satisfactory agreement with the detailed shape of the experimental scattering data [22].…”

Dynamic Ion Structure Factor of Warm Dense Matter

“…It combines the Mermin Ansatz for the dielectric function with the formalism of LFCs to describe both strong correlations and collisions [24]. For the density response function follows…”

“…(3) and the collision frequency ν(ω) can be calculated, e.g., in the Born approximation [24,25]. However, this approach is usually used for systems with Coulomb interactions.…”

Free-Electron X-Ray Laser Measurements of Collisional-Damped Plasmons in Isochorically Heated Warm Dense Matter

“…The comparison with theoretical predictions confirms that the plasmon spectrum is sensitive to frequency-dependent electron-ion collision processes which are related to the electrical conductivity. By taking into account strong collisions and dynamical screening [31,40], collisions are treated beyond the Born approximation. We find that this theory establishes agreement with our experimental observations near the plasmon resonance frequency.…”