Abstract
The light emission spectra of a discharge excited by the high-frequency and microwave radiation sources in mixtures of sulfur with buffer gas (argon or neon) were experimentally studied. Various stages of changing the characteristic spectra in the process of discharge development were revealed. The temperature dependences of the absorption spectra of sulfur saturated vapor were measured up to 1000 K. A linear shift of the absorption line from the violet to the green region with temperature was found. The absorptivity rises steeply and reaches of 3 cm-1 at T=1000 K. The analysis shows that the same temperature dependence is observed for the maximum of the emission line. The filtering of light by colder sulfur vapor in the vicinity of the walls is supposedly responsible for the increase in the optical absorption at shorter wavelength. This explains the nontrivial increase in the wavelength of maximum of the spectral radiant intensity with temperature.
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