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Cluster virial expansion of the equation of state for hydrogen plasma with e-H2 contributions

Y. A. Omarbakiyeva1,2,*, H. Reinholz1,3, and G. Röpke1

  • 1Institute of Physics, University of Rostock, D-18051 Rostock, Germany
  • 2International IT University, 050040 Almaty, Kazakhstan
  • 3The University of Western Australia, Crawley, Western Australia 6009, Australia

  • *yultuz.omarbakiyeva@uni-rostock.de

Phys. Rev. E 91, 043103 – Published 20 April, 2015

DOI: https://doi.org/10.1103/PhysRevE.91.043103

Abstract

The equation of state of partially ionized hydrogen plasma is considered with special focus on the contribution of the eH2 interaction. Traditional semiempirical concepts such as the excluded volume are improved using microscopic approaches to treat the eH2 problem. Within a cluster virial expansion, the Beth-Uhlenbeck formula is applied to infer the contribution of bound and scattering states to the temperature-dependent second virial coefficient. The scattering states are calculated using the phase expansion method for the polarization interaction that incorporates experimental data for the eH2 scattering cross section. We present results for the scattering phase shifts, differential scattering cross sections, and the second virial coefficient due to the eH2 interaction. The influence of this interaction on the composition of the partially ionized hydrogen plasma is confined to the parameter range where both the H2 and the free-electron components are abundant.

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