Analysis of the Mid-Infrared Spectrum of the Exhaust Gas From an Atmospheric Pressure Plasma Jet (APPJ) Working With an Argon–Air Mixture

The mid-infrared (IR) absorption spectrum of the exhaust gas of an atmospheric pressure plasma jet operated in Ar with the admixture of 0.1% of air has been monitored in the spectral region from 4000 to 750 cm<sup>-1</sup>. The absorption features of CO<sub>2</sub>, CO, NO, NO<sub>2</sub>, N<sub>2</sub>O, HNO<sub>2</sub>, and HNO<sub>3</sub> were identified using a Fourier transform IR spectrometer combined with a multipass cell with 30-m absorption path length. The production rates of these molecules to be in the range of 0.5 to 4 times10<sup>18</sup> molecules s<sup>-1</sup> were estimated.

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