Polarized angular-dependent reflectivity and density-dependent profiles of shock-compressed xenon plasmas

The investigation of the optics of shock‐compressed strongly correlated plasma

“…As known from the dynamical conductivity when taking into account collision cross-sections, the contributions of electron-electron collisions, which are relevant in the non-degenerate region Θ ≫ 1, can be taken into account via a renormalization factor, see refs. [11,14].…”

“…To compensate for the part of the reflected radiation lost due to clipping by the internal elements of the gas cell at large angles of interaction between the plasma and the probing electromagnetic wave, additional measurements of the distribution of the reflected energy in space were carried out, see ref. [11].…”

“…The first experimental studies on optical properties of strongly correlated plasmas were carried out under the leadership of academician V. E. Fortov. [ 1,2 ] The interaction of a plasma with an electromagnetic wave under normal incidence on the surface of the environment under study, showed the need to consider and research the thin transition region between a massive plasma and the unperturbed space. Further experimental study of dense plasma optics using oblique sensing and different wavelengths, as well as interaction modelling based on the solution of wave field equations, density functional theory, and particle in cell simulations, confirm the correctness of this conclusion.…”

Measurement of dense plasma temperature of the shock‐compressed silicon

“…The method for calculating the permittivity of a shock-compressed non-ideal plasma is described in ref. [32,52,53]. To determine the emissivity of the SW, we took into account the re-reflections of radiation from the silicon-air interface.…”

“…[8] The observed effect can be possibly explained if one takes into account the process of establishing ionization equilibrium behind the SW front in substance, as it was done in ref. [3,53,54] for ionic crystals and xenon. The constants for this process at megabar pressures are unknown; therefore, estimates were made under the assumption that the characteristic relaxation length is L ∼ 10 μm.…”