title: Cluster virial expansion of the equation of state for hydrogen plasma with e-H(2) contributions.
abstract: The equation of state of partially ionized hydrogen plasma is considered with special focus on the contribution of the e-H(2) interaction. Traditional semiempirical concepts such as the excluded volume are improved using microscopic approaches to treat the e-H(2) 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 e-H(2) scattering cross section. We present results for the scattering phase shifts, differential scattering cross sections, and the second virial coefficient due to the e-H(2) interaction. The influence of this interaction on the composition of the partially ionized hydrogen plasma is confined to the parameter range where both the H(2) and the free-electron components are abundant.
authors.affiliation: Institute of Physics, University of Rostock, D-18051 Rostock, Germany.|International IT University, 050040 Almaty, Kazakhstan.
authors.forename: Y A
authors.initials: YA
authors.lastname: Omarbakiyeva
authors.affiliation: Institute of Physics, University of Rostock, D-18051 Rostock, Germany.|The University of Western Australia, Crawley, Western Australia 6009, Australia.
authors.forename: H
authors.initials: H
authors.lastname: Reinholz
authors.affiliation: Institute of Physics, University of Rostock, D-18051 Rostock, Germany.
authors.forename: G
authors.initials: G
authors.lastname: Röpke