Out-of-equilibrium conditions in x-ray Thomson scattering experiments

We study out-of-equilibrium conditions in recent x-ray Thomson scattering experiments performed in warm dense matter. We use an effective one-component plasma model to characterize the states in which electron and ion temperatures are different. An estimation of the ion temperature is obtained. This method is tested against two recent experiments. Strong out-of-equilibrium conditions are found.

Figure 1

${|f\left(k\right)+q\left(k\right)|}^2{S}_{ii}\left(k\right)$ as a function of momentum $k$ in $T_e=10\mathrm{eV}$ and three-times solid-density aluminum. Self-consistent hard-sphere (HS) and OCP (OCP) are compared to experimental data points (Expt.) and to the calculation for which $\mathrm{\Gamma }=55$ [OCP(55)].

Figure 2

X-ray Thomson scattering spectrum as a function of energy. The scaalp calculation (scaalp) with an OCP parameter equal to 12 is compared to experimental data points (Expt.).

Figure 3

OCP structure factors corresponding to $\mathrm{\Gamma }=12$ and $\mathrm{\Gamma }=55$.