Nitric oxide (NO) concentrations were measured using the $\gamma$ band system spectrum based on the strong self-absorption effect of NO in pulsed corona discharges. The radiative transitional intensities of the NO $\gamma$ band were simulated based on the theory of molecular spectroscopy. The intensities of some bands, especially $\gamma (0,0)$ and $\gamma (1,0)$, are weakened by the self-absorption. The correlations between the spectral self-absorption intensities and NO concentration were validated using a modified Beer–Lambert law with a combined factor $K$ relating the branching ratio and the NO concentration, and a nonlinear index $\alpha$ that is applicable to the broadband system. Optical emissive spectra in pulsed corona discharges in NO and ${\mathrm{N}}_2/\mathrm{He}$ mixtures were used to evaluate the two parameters for various conditions. Good agreement between the experimental and theoretical results verifies the self-absorption behavior seen in the UV spectra of the NO $\gamma$ bands.

© 2012 Optical Society of America

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