Rate coefficient of the reaction CH2OO + NO2 probed with a quantum-cascade laser near 11 μm

Pei Ling Luo, Chen An Chung, Yuan-Pern Lee*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The reaction of the simplest Criegee intermediate CH2OO with NO2 is considered to be important in atmospheric chemistry because of its prospective contribution to the decay of CH2OO and the additional source of NO3, hence its effects on the NOx and HOx cycles. The reported rate coefficients of this reaction varied by a factor of 5. Employing a cw quantum-cascade laser with wavelength near 11 μm coupled with Herriott mirrors to probe CH2OO sensitively, we investigated in detail the reaction CH2OO + NO2 under total pressure 5.9-9.7 Torr at 298 K and reported a rate coefficient kNO2 = (1.0 ± 0.2) × 10-12 cm3 molecule-1 s-1, about one-seventh the value determined with direct measurements of CH2OO by Weltz et al. This smaller rate coefficient implies that the title reaction contributes to the atmospheric source of NO3 and the decay of CH2OO much less than previously conceived.

Original languageEnglish
Pages (from-to)17578-17583
Number of pages6
JournalPhysical Chemistry Chemical Physics
Issue number32
StatePublished - 1 Jan 2019

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