Abstract

Optical spectroscopy was used to identify the chemical species and the state of excitation of these species in argon, air, and nitrogen plasmas. The 2400 to 8800 A wavelength region was studied. Copper-tungsten and graphite-graphite electrodes were used. The species observed were Ar, Ar⁺, O, N, N₂, N₂⁺, C, C₂, and CN, the latter three being due to graphite electrodes. The major species found correlated with those species predicted from thermodynamic calculations in air. However, certain species, NO and O₂, were not observed.

Experimental study on the characteristics of molecular emission spectroscopy for the analysis of solid materials containing C and N

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