Traveling Density Waves in Positive Columns

The continuity equations for positive ions and for electrons coupled to each other by the Coulomb force and the effect of ionizing collisions have a solution representing traveling density waves whose frequencies are widely different from the usual plasma oscillations

Energy distributions of particles striking the cathode in a glow discharge

Charge-exchange collision in the cathode fall region of an abnormal glow discharge is assumed to be the mechanism which limits the energy of the ions and generates the energetic neutrals bombarding the cathode. The model used by W. D. Davis and T. A. Vanderslice Phys. Rev. 131 219 (1963) for the calculation of the ion distribution was not applied to calculate the distribution of neutrals. A transport formulation is proposed that allows the calculation of both the distributions of energetic ions and fast neutrals.This work is part of a research project under the auspices of the Spanish-CAICYT (Proyecto No. 599), in collaboration with the University of Salford (financially supported by The British Council and the Spanish MEC)