Spectroscopic survey of HCHO + N2 glow electric discharge plasma in spectral ranges of optical and near together with middle ultraviolet emission (panel A), shown in nanometer scale, and middle infrared emission (panel B), shown in cm−1 scale. In this figure, we show appropriate spectral units commonly used in each particular region; corresponding wavenumbers and wavelengths are also illustrated for both spectral ranges. Dominant molecular and radical emission bands belong to •OH, CO, •CH, •CN, N2, CO2, HCN, HNC species (Okabe 1970; Nemes et al. 2000; Camacho et al. 2008; Rothman et al. 2013; Civis et al. 2008, 2016b). Panel C depicts FTIR absorption spectra of discharge products trapped in the liquid nitrogen trap. Besides HCN and CO2, NH3, C2H2, H2O, HCOOH, and N2O molecules are additionally detected.
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