  Spectroscopic characterization of a specific case of the atmospheric pressure
air jet plasma in the transverse cw dc arc discharge of high voltage was done.
Within the spectrum of wavelengths from 200 to 1100 nm all remarkable emissions
were monitored, and all excited atomic lines of N, O, H and molecular bands of
NO, N2, O2, OH, CO, CN were identified. Using relative intensities of
analytical CuI lines 510.5, 515.3, 521.8 nm (the product of electrode emission)
and N2 2+ -system band at 337.1 nm (the dominating component of plasma-forming
gas), the temperature of electronic excitation of free atoms, Texc, and the
temperatures of excitation of vibrational and rotational states of molecules,
TV and TR, were determined. It was found that there is no local LTE in this arc
discharge air plasma during its space/time evolution, and effects of strong
non-izothermality have a place in this case.
