Detection of Nitric Oxide by the Resonance Absorption Technique

Abstract

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.