Transient species in the ozonolysis of tetramethylethene |
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Authors: | Xiaolu Yang Jianguo Deng Dong Li Jianhua Chen Yisheng Xu Kai Zhang Xiaona Shang Qing Cao |
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Institution: | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China;School of Environment, Tsinghua University, Beijing 100084, China |
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Abstract: | 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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Keywords: | Corresponding author Tetramethylethylene Ozone Criegee mechanism Matrix isolation Quantum chemical calculations |
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