The article discusses the electrostatic waves in plasmas containing positive and negative ions of equal mass and opposite charge. Numerical analysis showed that the electron plasma mode in a cold plasma may become backward due to the density gradient and may be controlled either by the electron number density or the mode number in the perpendicular direction. It is said that an instability may develop in plasma with hot electrons.
Copyright 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Multifacets of dusty plasmas : fifth International Conference on the Physics of Dusty Plasmas, p. 339-340 and may be found at http://dx.doi.org/10.1063/1.2997262