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P: Fachverband Plasmaphysik

P 19: Poster: Theorie und Modellierung

P 19.19: Poster

Thursday, February 28, 2013, 14:00–16:00, Poster EG

Cluster virial expansion for partially ionized plasmas — •Niels-Uwe Bastian, Heidi Reinholz, and Gerd Röpke — Universität Rostock

The chemical picture serves as an intuitive concept to treat the low-density limit of many-particle systems forming clusters (bound states). Systematic quantum statistical approaches allow to combine the mass action law with mean-field concepts. Within a generalized Beth-Uhlenbeck approach, the quasiparticle virial expansion and the suppression of correlations due to screening and Pauli blocking is formulated. This approach is generalized to include arbitrary clusters, where special attention must be paid to avoid inconsistencies such as double counting. The contribution of the continuum to the virial coefficients can be reduced considering separately excited states and quasiparticle energies. The cluster-virial expansion connects known benchmarks at low densities as well as at high densities. In detail the electron, proton and atom system is considered.