NO2 kinetic studies using laser-induced fluorescence

Abstract

A laser-induced fluorescence technique has been used to monitor NO₂ in kinetic studies involving this species. Rate-constant values of 2.0, 6.4, 6.8, 11.3 and 22.5µ10^–11 cm³ molecule^–1 s^–1 have been measured at 300 K for the quenching of NO₂ fluorescence (excitation wavelength 447.9 nm) by Ar, NO₂, CH₂O, CH₃OH and methoxyethyl nitrate, respectively; the rate constants for quenching by Ar and NO₂ are essentially unchanged when the temperature is raised to 590 K. A preliminary study of the reaction of NO₂ with CH₃OH in the temperature range 639 ≤ T/K ≤ 713 has yielded 6.1µ10^–13 cm³ molecule^–1 s^–1 and 21.4 kcal mol^–1 for the pre-exponential factor and activation energy, respectively.