Preliminary study on direct measurements and diagnostics for chemical reaction dynamics of NOx by using laser wavelength modulation spectroscopy

Studies on the kinetics of gas-phase chemical reactions currently rely on calculations or simulations and lack simple,fast,and accurate direct measurement methods.We developed a tunable laser molecular absorption spectroscopy measure-ment system to achieve direct measurements of such reactions by using wavelength modulated spectroscopy and per-formed online measurements and diagnostics of molecular concentration,reaction temperature,and pressure change during the redox reaction of ozone with nitrogen oxides[NOx]with 0.1 s temporal resolution.This study provides a promising diagnostic tool for studying gas-phase chemical reaction kinetics.