Greifswald 2009 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 18: Poster: Theorie/Modellierung

P 18.1: Poster

Mittwoch, 1. April 2009, 17:30–19:30, Foyer des IfP

Dynamical collision frequency in warm dense matter — •Mathias Winkel, Heidi Reinholz, August Wierling, and Gerd Röpke — Institut für Physik, Universität Rostock

The dynamical collision frequency is the central quantity for calculating the dielectric function in warm dense matter. In particular, we are interested in static transport properties, e.g. dc-conductivity, and optical properties, e.g. reflectivity [1]. The description over a wide parameter region of the plasma’s temperature, density, ionization degree and frequency is subject of current research.

Based on a generalized linear response theory, the dynamical collision frequency has been calculated in different approximations. Within the Gould-deWitt approach, dynamical screening and strong collisions have been taken into account [2, 3].

We discuss interpolational expressions for the dynamical collision frequency from its respective limiting cases over a wide parameter range and present exemplary results for optical frequencies.

Additionally, we compare the influence of these approximations on the dielectric function with expressions, that result from a treatment of collisions with the help of kinetic theory [4].

[1] T.  Raitza et al. J. Phys. A: Math Gen. 39, 4393 (2006)

[2] H. Reinholz et al., Phys. Rev. E 62, 5648 (2000)

[3] H. Reinholz, Annales de Physique Vol. 30, Issue 4-5 (2005)

[4] M. Veysman et al. Poster contribution to the ECLIM 2008 Conference