Positive column of classic fluorescent discharge lamps has been extensively studied in the past years. In this paper, we use a collisional radiative model to study the low-pressure positive column of discharge lamps filled with only pure gases: neon, argon, or xenon. We show the electron temperature, the electron density, and the electric field. By adding the atomic to molecular ions conversion, we extend the pressure range from 1 to 50 torr. Finally, we show evolution of the molecular ions densities in the rare gases' positive column.Index Terms-Argon, collisional radiative model, low and middle pressure, molecular ions, neon, positive column, xenon.

The purpose of this paper is that to present a concise review of the method used up to now for the description of electrical discharge lamps a part of an electronic circuit. Several attempts to describe the lamp by an equivalent electric circuit have been made with more or less accurate results. Some attempts to integrate "physical" discharge models based in the electrical conductivity of the plasma have been achieved also.

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