![]() Excitations to higher rotational quantum numbers (Nʹ) inhibited thermalization of the rotational distributions, and the rotational temperatures were found to increase proportionally with excitations to higher Nʹ numbers. Realization of the estimated values for rotational temperatures, as an estimation of the gas temperature, depend on thermalization of the accounted excited rotational population levels. The electrical characteristics and images of the discharge were also examined to analyze the discharge nature. In this work, the rotational temperatures of the atmospheric pressure AC-excited argon gas-liquid-phase discharge estimated by employing disparate spectroscopic methods on the rotational structure of molecular OH (A–X), NO-γ (A–X), and N2 (C–B) bands-spectra emanating from the gas-phase discharge region were compared with those obtained from the liquid-phase region to analyze their variations based on the metastable species and rotational quantum numbers.
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