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The resonance absorption method is described for detecting ppm concentrations of NO mixed with other gases. As source lamp for the emission of the NO γ system, A 2  ∑ + - X  2 ∏, a hollow cathode discharge has been used operating in streaming air at low discharge current (∼). NO detection is achieved by a double-beam technique with single-beam optics. The experimental average absorption coefficient obtained for the γ (0,0) band is compared with the calculated value. Relevant NO spectroscopic information is reported.

Detection of Nitric Oxide by the Resonance Absorption Technique