Optical Emission Spectroscopy of H $_{\mathrm {\gamma }}$ , H $_{\mathrm {\alpha }}$ , and H $_{\mathrm {\beta }}$ in a Glow Discharge Mixture of Ar/H2

In this paper, the addition of Ar to H
₂
is experimentally investigated. This paper primarily aims to observe the effects that this addition has on the intensity of hydrogen emission lines in a glow discharge mixture. The total pressure was 3 torr, at a power level of 3.9 W. Optical emission spectroscopy was used for plasma characterization, and the principal species observed were H
_γ
(434 nm), H
_β
(486.1 nm), H
_α
(656.3 nm), and H
₂
(603.1 nm), and Ar I (750.5 nm), Ar I (763.5 nm), and Ar I (811.6 nm). The electron temperature and ion density were determined by a double Langmuir probe. The electron temperature was found to be in the range of 2.5-6.5 eV, and the ion concentration was on the order of 109 cm
^-3
.