Abstract
Regarding spectroscopy diagnostics via line-intensity ratio of high-density diffusion-controlled discharges in helium–argon gas mixtures, the study presents a collisional-radiative model of the discharge. In order to show variations of excited-state population densities and line-intensity ratios related to changes of plasma density and electron temperature, the model is applied to surface-wave-sustained discharges, since the axial structure of these discharges displays self-consistent variations of the discharge characteristics. The comparison with the corona model shows the necessity of developing a collisional-radiative model. Possibilities for simultaneous determination—based on the collisional-radiative model—of electron temperature and plasma density from measurements of line-intensity ratios are outlined.
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