Transient species in the ozonolysis of tetramethylethene

Qing Cao , Xiaolu Yang , Jianguo Deng , Dong Li , Jianhua Chen , Yisheng Xu , Kai Zhang , Xiaona Shang , Tao WANG , Jianmin CHEN , Abdelwahid Mellouki , Christian GEORGE , Yujing MU , Hong LI


Received September 29, 2019,Revised , Accepted March 17, 2020, Available online April 30, 2020

Volume 32,2020,Pages 210-216

The reaction of alkenes with ozone has great effect on atmospheric oxidation, its transient species can produce OH radicals and contribute to the formation of secondary organic aerosols (SOA). In the present study, the reaction of tetramethylethene (TME) with ozone was investigated using self-assembled low temperature matrix isolation system. The TME and ozone were co-deposited on a salt plate at 15 K, and then slowly warmed up the plate. The first transient species primary ozonide (POZ) was detected, indicating that the reaction followed Criegee mechanism. Then POZ began to decompose at 180 K. However, secondary ozonide (SOZ) was not observed according to Criegee mechanism. Probably, Criegee Intermediate (CI) did not react with inert carbonyl of acetone, but with remaining TME formed tetra-methyl epoxide (EPO).

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