Equation of state of classical Coulomb plasma mixtures

A. Y. Potekhin1,2, G. Chabrier2, A. I. Chugunov1, H. E. DeWitt3, F. J. Rogers3
1Ioffe Physical-Technical Institute, 26 Politekhnicheskaya st., Saint-Petersburg, 194021 Russia
2CRAL, UMR CNRS 5574), 69364 Lyon Cedex 07, France
3Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, CA 94550, USA

The new analytic approximation for the equation of state of fully ionized nonideal electron-ion plasma mixtures is constructed. It covers the transition between the weak and strong Coulomb coupling regimes and reproduces numerical results obtained in the hypernetted-chain (HNC) approximation and recent Monte Carlo simulations. A generalization of linear mixing rule for arbitrary coupling is proposed.

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