Abstract
A model for the positive columns of dc low‐pressure discharges in Cs–Ar mixtures, which includes radial depletion of Cs ground‐state atoms and radiation trapping, is presented. The available experimental data for this discharge system were extended in such a way that comparison could be made between model calculations and experiments for a wide range of discharge currents and Cs vapor densities (0.2 × 1019−3.0 × 1019 m−3) and a reasonable agreement is obtained.