Addendum to "Equation of state of classical Coulomb plasma mixtures"

TL;DR

This paper refines an existing analytic model for the equation of state of ionized plasma mixtures by incorporating new Monte Carlo simulation data and proposing a generalized mixing rule for weak coupling regimes.

Contribution

It introduces modifications to the previous model to better fit Monte Carlo results and proposes a new mixing rule applicable in weak coupling conditions.

Findings

Model accurately fits Monte Carlo simulation deviations in strong coupling.

Proposed mixing rule generalizes post-Debye density corrections for mixtures.

Model reproduces numerical results across coupling regimes.

Abstract

Recently developed analytic approximation for the equation of state of fully ionized nonideal electron-ion plasma mixtures [Potekhin et al., Phys. Rev. E, 79, 016411 (2009); arXiv:0812.4344], which covers the transition between the weak and strong Coulomb coupling regimes and reproduces numerical results obtained in the hypernetted chain (HNC) approximation, is modified in order to fit the small deviations from the linear mixing in the strong coupling regime, revealed by recent Monte Carlo simulations. In addition, a mixing rule is proposed for the regime of weak coupling, which generalizes post-Debye density corrections to the case of mixtures and numerically agrees with the HNC approximation in that regime.