Contribution to the theory of non-self-maintaining volume discharges in molecular and noble gases

Abstract

Results are presented of investigations of non-self-maintaining volume (NV) gas discharges. The structure is investigated and the current-voltage characteristics are plotted of NV discharges in molecular gas. The characteristic times of the transient processes in the cathode layer of a nonstationary electron-beam-controlled (EBC) discharge are obtained. It is proposed to use an NV discharge as the nonlinear element of a relaxation-oscillation laser. Results are presented of computer experiments with such a laser. The influence of the hydrodynamic motion of the mixture on the characteristics of the cathode layer of an open-cycle cw EBC laser is investigated. It is shown that the ultraviolet emission of excimer molecules alters radically the structure of the cathode layer of an EBC discharge in a noble gas, viz., the intense photoeffect on the cathode leads to the appearance of a negative cathode potential drop. Self-maintaining photoionization and EBC discharges in a noble gas are considered; in these discharges the plasma density is maintained by impurity ionization or by electron-excitation of the atoms by emission from excimer molecules.