Abstract
Nitric oxide (NO) concentrations were measured using the band system spectrum based on the strong self-absorption effect of NO in pulsed corona discharges. The radiative transitional intensities of the NO band were simulated based on the theory of molecular spectroscopy. The intensities of some bands, especially and , 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 relating the branching ratio and the NO concentration, and a nonlinear index that is applicable to the broadband system. Optical emissive spectra in pulsed corona discharges in NO and 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 bands.
©2012 Optical Society of America
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