Eur. Phys. J. B 37, 39-46 (2004)
https://doi.org/10.1140/epjb/e2004-00028-x

Electric field dynamics at charged point in two component plasma

¹ Laboratoire des Énergies Nouvelles et Renouvelables dans les Zones Arides et Sahariennes Lenreza, Université de Ouargla 30000, Algeria
² Laboratoire des Interactions Ioniques et Moléculaires PIIM, service 232 Centre Saint-Jérôme, 13397 Marseille, France
³ Department of Physics, University of Florida, Gainesville, Florida 32611, USA

Corresponding author: ^a meftah@ouargla-univ.dz

Received: 30 July 2002
Revised: 11 August 2003
Published online: 19 February 2004

Abstract

The autocorrelation function for the velocity and for the electric microfield of an impurity ion in a Two Ionic Component Plasma (TICP) is considered. A simple model is constructed for this purpose that preserves the exact short time dynamics and the long time global constraint of a given self-diffusion coefficient. The memory function and then the collision effects associated with the correlation function for the self-diffusion are expressed in terms of an effective two body interaction via a screened effective potential. The basic approximation used in our approach is the “disconnected” one that refers to the collision operator. A comparison of the prediction of this model for the self-diffusion and for the autocorrelation functions with the results of the molecular dynamics simulation developed in our laboratory (PIIM) shows an acceptable agreement over a wide range of plasma coupling, impurity ion charge and concentration.