Thomson scattering from dense inhomogeneous plasmas

T.-N. Beuermann, R. Redmer, and Th. Bornath
Phys. Rev. E 99, 053205 – Published 13 May 2019

Abstract

X-ray Thomson scattering experiments in the soft and hard x-ray regime yield information on fundamental parameters of high-density systems. Pump-probe experiments with variable time delay provide insight into the excitation and relaxation dynamics in dense plasmas. On short time scales, a local thermodynamic equilibrium description might not be sufficient. Besides nonequilibrium effects on the electron distribution function, spatial inhomogeneities influence the scattering signal. Generalizing previous approaches of Belyi [Phys. Rev. E 97, 053204 (2018)] and Kozlowski et al. [Sci. Rep. 6, 24283 (2016)], we discuss implications for Thomson scattering spectra for inhomogeneous plasmas in the warm dense matter regime based on a gradient expansion within real-time Green's-functions theory. Especially in the collective scattering regime, Thomson scattering spectra are modifed substantially by spatial inhomogeneities. Within a first-order gradient expansion, the dispersion relation for plasmons is determined. In particular, the ratio of the heights of the plasmon peaks is changed which prevents a simple estimation of the plasma temperature from the detailed balance relation.

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  • Received 21 December 2018

DOI:https://doi.org/10.1103/PhysRevE.99.053205

©2019 American Physical Society

Physics Subject Headings (PhySH)

Plasma Physics

Authors & Affiliations

T.-N. Beuermann, R. Redmer, and Th. Bornath*

  • Institut für Physik, Universität Rostock, D-18051 Rostock, Germany

  • *thomas.bornath@uni-rostock.de

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Issue

Vol. 99, Iss. 5 — May 2019

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