Fig. 2
Raw emission spectrum of the nitrogen gas discharge operated at a MW power of 50 W. Strong vibrational bands from the First Positive System of 14N2 are labeled (v′−v′′) for orientation using band origin wavenumbers as given by Gilmore et al. (1992). The spectral range below 4200 cm-1 (gray box) does not contain any emission lines and was used to determine the absolute noise level in the spectrum.
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