Densities of N- and O-atoms in N2–O2 flowing glow discharges by actinometry

In conditions of N2 and N2–O2 glow discharges at low power ( 30–150 W ) and low gas pressure ( 0.1–50 Torr ), the N- and O-atom densities can be determined by adding few percents of Ar gas as an actinometer and by measuring the Ar I 750.4, 811.5 nm, NI 744.2, 746.5, 821.6 nm and OI 777.3, 844.6 nm spectral line intensities. The actinometry control and calibration have to be obtained by TALIF for DC discharges and by NO titration for flowing microwave discharges.