Düsseldorf 2007 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 7: Poster
P 7.19: Poster
Montag, 19. März 2007, 16:30–18:30, Poster A
Electrical and Hall conductivity in Ar and Xe plasmas — •John Adams1,2, Heidi Reinholz1, Ronald Redmer1, Gerd Roepke1, and Martin French1 — 1Insitut für Physik, Universität Rostock, 18051 Rostock — 2School of Physics, University of Western Australia, Nedlands, WA 6907, Australia
Experiments on the electrical conductivity of inert gases have been revisited. Within the linear response theory of partially ionized plasmas [1], the description of electron-atom scattering using experimentally determined transport cross sections leads to a qualitatively improved description. It emphasizes the relevance of the Ramsauer minimum which had been neglected so far when using a polarization potential approach. The traditionally used degeneracy dependent Spitzer factor is critically discussed.
In recent years, noble gas plasmas have also been investigated under the influence of magnetic fields. In this context, the Hall conductivity is considered as a tool for diagnostics of the free electron density, which is otherwise not directly accessible for experimental determination. The linear response theory allows for a consistent investigation of the Hall coefficient and other thermoelectric transport properties. Within this approach, comparison [2] with recent experimental results for the Hall conductivity in partially ionized argon and xenon plasmas [3] is presented.
[1] Reinholz et al. PRE 52 (1995) 395; Redmer, PR 282 (1997) 35
[2] Adams et al. Contrib. Plasma Phys., in press
[3] N. S. Shilkin et al., ZETF 124 (2003) 1030 [JETP 97 (2003) 922]