Detection of nitric oxide at low ppb center dot m concentrations by differential absorption spectrometry using a fully diode-laser-based ultraviolet laser system
2007 (English)In: Journal of the Optical Society of America B, Vol. 24, no 9, 2294-2306 p.Article in journal (Refereed) Published
An instrumentation for detection of nitric oxide (NO) by direct absorption spectrometry in the parts in 109 (ppb) range on its electronic X2 Pi(v(n) = 0)-A(2)Sigma(+)(v' = 0) transition has been constructed around a commercially available fully diode-laser-based laser system producing milliwatts powers of ultraviolet light at similar to 226.6 run, and its analytical performance has been evaluated. It is shown that the system is capable of detecting NO down to 3 ppb . m 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 X 10(-18) cm(-1)/(molecule cm(-2)), which supersedes typical line strengths of the fundamental vibrational band and the first and second overtone bands of NO by similar to 2, similar to 4, and similar to 5 orders of magnitude, respectively Also the collision broadening and shift of the targeted lines in NO by N-2 have been assessed.
Place, publisher, year, edition, pages
2007. Vol. 24, no 9, 2294-2306 p.
Atom and Molecular Physics and Optics
IdentifiersURN: urn:nbn:se:umu:diva-8605OAI: oai:DiVA.org:umu-8605DiVA: diva2:148276