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The N2 second positive bands observed in high-temperature air plasmas are considered to be useful to determine internal states of high-temperature plasmas. In the experiments with a micro-air plasma-jet, the N2 second positive bands with higher vibrational levels (v′≥2) were found to show a characteristic intensity distribution. The intensity distribution could not be explained by a usual equilibrium radiation theory. In order to investigate the phenomenon, theoretical spectra were calculated by taking account of two effects, that is, predissociation of N2 C 3Πu state through C′3Πu state and non-Boltzmann rotational population distribution. This calculated spectra with such effects agreed very well with the experiments.

nihon kikai gakkai ronbunshū. b

Radiative Characteristics of N2 Second Positive Bands in High-temperature Plasmas (Analysis with Predissociation and Non-Boltzmann Rotational Population Distribution)