Simultaneous Infrared Detection of the ICH2OO Radical and Criegee Intermediate CH2OO: The Pressure Dependence of the Yield of CH2OO in the Reaction CH2I + O2

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• 作者：Yu-Hsuan Huang ; Li-Wei Chen ; Yuan-Pern Lee
• 刊名：The Journal of Physical Chemistry Letters
• 出版年：2015
• 出版时间：November 19, 2015
• 年：2015
• 卷：6
• 期：22
• 页码：4610-4615
• 全文大小：383K
• ISSN：1948-7185

文摘

The simplest Criegee intermediate CH₂OO, important in atmospheric reactions, has been recently produced from the reaction of CH₂I + O₂ and detected with various methods. In this reaction, the yield of CH₂OO decreases with increasing pressure because of the stabilization of the adduct ICH₂OO, but no definitive spectral identification of ICH₂OO has been reported. We recorded the infrared spectrum of ICH₂OO using the same reaction under high pressure; the spectrum agrees with that simulated according to theoretical predictions. With direct detection of both CH₂OO and ICH₂OO, we determined the pressure dependence of the yield of CH₂OO. The yield of CH₂OO near 1 atm is greater than previously reported values, which might have significant consequences in atmospheric chemistry.