%0 Journal Article %A Taatjes, Craig A. %A Meloni, Giovanni %A Selby, Talitha M. %A Trevitt, Adam J. %A Osborn, David L. %A Percival, Carl J. %A Shallcross, Dudley E. %D 2008 %T Direct Observation of the Gas-Phase Criegee Intermediate (CH2OO) %U https://acs.figshare.com/articles/journal_contribution/Direct_Observation_of_the_Gas_Phase_Criegee_Intermediate_CH_sub_2_sub_OO_/2914807 %R 10.1021/ja804165q.s001 %2 https://ndownloader.figshare.com/files/4613104 %K CH 2OO oxide species %K CH 2OO %K formaldehyde oxide %K tropospheric oxidation %K rate coefficients %K Direct Observation %K combustion processes %K dimethyl sulfoxide %K kinetics studies %K gas phase Criegee %K DMSO oxidation %K gas phase carbonyl oxide reactions %K carbonyl oxides %X Carbonyl oxide species play a key role in tropospheric oxidation of organic molecules and in low-temperature combustion processes. In the late 1940s, Criegee first postulated the participation of carbonyl oxides, now often called “Criegee intermediates,” in ozonolysis of alkenes. However, despite decades of effort, no gas phase Criegee intermediate has before been observed. As a result, knowledge of gas phase carbonyl oxide reactions has heretofore been inferred by indirect means, with derived rate coefficients spanning orders of magnitude. We have directly detected the primary Criegee intermediate, formaldehyde oxide (CH2OO), in the chlorine-initiated gas-phase oxidation of dimethyl sulfoxide (DMSO). This work not only establishes that the Criegee intermediate is formed in DMSO oxidation also but opens the possibility for explicit kinetics studies on this critical atmospheric species. %I ACS Publications