Isomerization and Decay of a Criegee Intermediate CH3CHOO in the Earth’s Upper Atmosphere

Criegee intermediates, or carbonyl oxides, are formed during the ozonolysis of alkenes, which are typical anthropogenic air pollutants. They play an important role in a variety of chemical reactions occurring both in the near-surface layer and in the upper layers of the Earth’s atmosphere. In the lo...

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Bibliographic Details
Published in:Russian journal of physical chemistry. B 2021-05, Vol.15 (3), p.559-565
Main Authors: Dyakov, Yu. A., Adamson, S.O., Wang, P. K., Golubkov, G. V., Olkhov, O. A., Peskov, V. D., Rodionov, I. D., Rodionova, I. P., Rodionov, A. I., Shapovalov, V. L., Shestakov, D. V., Golubkov, M. G.
Format: Article
Language:English
Subjects:
Alkenes
Atomic oxygen
Carbonyls
Chemical Physics of Atmospheric Phenomena
Chemical reactions
Chemistry
Chemistry and Materials Science
Decay
Decomposition reactions
Fragments
Isomerization
Mesosphere
Physical Chemistry
Pollutants
Surface layers
Troposphere
Upper atmosphere
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Summary:Criegee intermediates, or carbonyl oxides, are formed during the ozonolysis of alkenes, which are typical anthropogenic air pollutants. They play an important role in a variety of chemical reactions occurring both in the near-surface layer and in the upper layers of the Earth’s atmosphere. In the lower troposphere, Criegee intermediates have time to lose their internal vibrational energy due to collisions with nitrogen molecules and interact with other components of the atmosphere in their original form. The products of such reactions are, for example, sulfuric and nitric acids. In the stratosphere and mesosphere, Criegee intermediates decompose into chemically active fragments that participate in a variety of secondary reactions. In this study, we consider the processes of decomposition of the methylcarbonyloxide isomer anti -CH 3 CHOO in the upper atmosphere. It is shown that the main decay products are atomic oxygen, methane, CO, CO 2 , and OH radicals. The formation of more complex chemically active fragments is also possible.
ISSN:1990-7931
1990-7923
DOI:10.1134/S1990793121030040