Title :
Towards Realization of Reactive Gas Amount of Substance Standards Through Spectroscopic Measurements
Author :
Chu, Pamela M. ; Nelson, David D. ; Zahniser, Mark S., Jr. ; McManus, Barry J. ; Shi, Quan ; Travis, John C.
Author_Institution :
Nat. Inst. of Stand. & Technol., Gaithersburg, MD
fDate :
4/1/2007 12:00:00 AM
Abstract :
This paper discusses the use of high-precision direct absorption spectroscopy to realize the amount of substance standards for ozone (O 3), a reactive species which cannot be delivered through traditional gravimetrically based gas cylinder standards. The O3 amount of substance is linked to the known concentrations of nitric oxide (NO) and nitrogen dioxide (NO2) through a gas-phase titration reaction and spectroscopic measurements using room-temperature pulsed quantum-cascade lasers. Ultimately, this approach will allow the determination of an O3 transition line strength linked to the primary gravimetric standards of NO and NO 2. The line strength can be used in future measurements to determine O3 concentrations of unknown samples
Keywords :
chemical variables measurement; density measurement; measurement standards; nitrogen compounds; ozone; spectrochemical analysis; direct absorption spectroscopy; gas reference standards; gas-phase titration reaction; nitric oxide; nitrogen dioxide; ozone; pulsed quantum-cascade lasers; reactive gas amount; spectroscopic measurements; substance standards; transition line strength; Absorption; Atmospheric measurements; Laser transitions; Measurement standards; NIST; Nitrogen; Optical pulses; Pollution measurement; Pulse measurements; Spectroscopy; Absorption spectroscopy; gas reference standards; ozone; traceability;
Journal_Title :
Instrumentation and Measurement, IEEE Transactions on
DOI :
10.1109/TIM.2007.891151
