Fig. 18.
Optical spectrum between 280 and 560 nm (top) and between 560 and 950 nm (bottom) of a plasma produced in a flowing mixture of CH4 (1 sccm) and N2 (1 sccm). The inserts show the CN, 
, and N2 bands. The corresponding mass spectrum is shown in Fig. 17, and the results from the rotational spectroscopy during this plasma experiment are shown in Fig. 16.
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