Abstract
An experimental arrangement has been set up to study the transient state of an electric arc which involves a simple switching device and an appropriate data acquisition set-up. This set-up allows one to register the decay of some of the lines of neutral argon, and to show the variations of this decay with the gas purity, the current intensity and the arc chamber diameter. The spatial and time-dependent variations of the temperature have been measured by the relative line-intensity method. With the complete LTE hypothesis, the spatial and time-dependent variations of the electronic density and hence the approximate values of the recombination coefficient have been determined.
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