Abstract

An instrumentation for detection of nitric oxide (NO) by direct absorption spectrometry in the parts in 109 (ppb) range on its electronic X2Π(ν=0)A2Σ+(ν=0) transition has been constructed around a commercially available fully diode-laser-based laser system producing milliwatts powers of ultraviolet light at 226.6nm, and its analytical performance has been evaluated. It is shown that the system is capable of detecting NO down to 3ppbm under low-pressure conditions (at a signal-to-noise ratio of 3 for a signal averaging of 5s), which is 2 orders of magnitude below that of any other diode-laser-based absorption technique. The combined line strength of the targeted lines was assessed to 3.1×1018cm1(moleculecm2), which supersedes typical line strengths of the fundamental vibrational band and the first and second overtone bands of NO by 2, 4, and 5 orders of magnitude, respectively. Also the collision broadening and shift of the targeted lines in NO by N2 have been assessed.

© 2007 Optical Society of America

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