Infrared absorption spectrum of the simplest criegee intermediate CH 2OO

Yu Te Su, Yu Hsuan Huang, Henryk A. Witek*, Yuan Pern Lee

*Corresponding author for this work

研究成果: Article

179 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)174-176
頁數3
期刊Science
340
發行號6129
DOIs
出版狀態Published - 12 四月 2013

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