Abstract
An analytic model for a three-component electronegative plasma has been developed within the framework of a diffusion–drift approximation. Anode fall voltage and anode sheath thickness are found for elevated-pressure glow discharge. The predicted voltage–current dependencies are compared to available experimental and numerical results for dc glow discharges in air at pressures of 40–100 Torr. Electronegative ions increase the anode fall voltage at high current densities, including the values for anode spots, and reduce the anode fall voltage at low current densities, but pass through a minimum at a critical value of their concentration.
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