Infrared absorption spectrum of the simplest criegee intermediate CH 2OO

Yu Te Su, Yu Hsuan Huang, Henryk Arnold Witek*, Yuan-Pern Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

190 Scopus citations


The Criegee intermediates are carbonyl oxides postulated to play key roles in the reactions of ozone with unsaturated hydrocarbons; these reactions constitute an important mechanism for the removal of unsaturated hydrocarbons and for the production of OH in the atmosphere. Here, we report the transient infrared (IR) absorption spectrum of the simplest Criegee intermediate CH 2OO, produced from CH2I + O2 in a flow reactor, using a step-scan Fourier-transform spectrometer. The five observed bands provide definitive identification of this intermediate. The observed vibrational frequencies are more consistent with a zwitterion rather than a diradical structure of CH2OO. The direct IR detection of CH2OO should prove useful for kinetic and mechanistic investigations of the Criegee mechanism.

Original languageEnglish
Pages (from-to)174-176
Number of pages3
Issue number6129
StatePublished - 12 Apr 2013

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