Self-consistent description of optical properties of warm dense matter Текст научной статьи по специальности «Электротехника, электронная техника, информационные технологии»

G.E. Norman1,2, I.M. Saitov1

SELF-CONSISTENT DESCRIPTION OF OPTICAL PROPERTIES OF

WARM DENSE MATTER

Joint Institute for High Temperatures, Moscow 125412, Russia Moscow Institute of Physics and Technology, Dolgoprudny 141700, Russia

The reflectivity of shocked xenon was measured in the experiments of Mintsev and Zaporoghets [1, 2]. The method based on the Drude model fails to explain the measurement results [3]. Only the introduction of the significantly broadened width to the shock front (800 nm) gives a good agreement with the experiment. However, there are no evidences of this effect in experiment. The density functional theory approach (DFT) with the Kubo-Greenwood formula applied in [4] also does not give satisfactory agreement with the experiment. Our approach is based on DFT with the longitudinal expression for the imaginary dielectric function [5], which explains most of the experimental data [1, 2]. It should be noted that the main goal of experiments [1,2] was estimation of free electron density and plasma frequency in shocked xenon. The absence of adequate theoretical explanation of the experimental results [1, 2] did not allow obtaining reasonable estimation for these parameters. For calculation of plasma frequency we use method based on sum rules. This method allows to associate directly the calculated values of the plasma frequency and the reflection coefficient, and it is an advantage of this approach in comparison with the results of the chemical model. Using this method the dependence of the plasma frequency on density is investigated in hydrogen. The jump of plasma frequency and conductivity is obtained. The work is supported by Grant No. 14-19-01295 of the Russian Science Foundation.

1. V.B.Mintsev, Yu.B.Zaporogets. Contrib. Plasma Phys. 29, 493 (1989).

2. Yu.B.Zaporoghets, et al. J. Phys. A: Math. Gen. 39, 4329 (2006).

3. H.Reinholz, et al J. Phys. A: Math. Gen. 36, 5991 (2003).

4. M.P.Desjarlais. Contrib. Plasma Phys. 45, 300 (2005).

5. G. Norman, I. Saitov, V. Stegailov, P. Zhilyaev. Phys. Rev. E 91, 023105

(2015)