Abstract
An instrumentation for detection of nitric oxide by direct absorption spectrometry in the parts in (ppb) range on its electronic transition has been constructed around a commercially available fully diode-laser-based laser system producing milliwatts powers of ultraviolet light at , and its analytical performance has been evaluated. It is shown that the system is capable of detecting down to under low-pressure conditions (at a signal-to-noise ratio of 3 for a signal averaging of ), 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 , which supersedes typical line strengths of the fundamental vibrational band and the first and second overtone bands of by , , and orders of magnitude, respectively. Also the collision broadening and shift of the targeted lines in by have been assessed.
© 2007 Optical Society of America
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