Ozone-alkene reactions are of great importance in troposphere chemistry. To detect the early transient reactive intermediates and investigate the mechanisms of initial steps of ozonolysis of alkenes, experiments are carried out in a injection fast flow reactor under the conditions of relatively low pressure (8-40 Torr) and room temperature. The alkenes investigated include ethylene, cis-2-butene and tetramethylethylene. CO is used as an OH scavenger to reduce the reactions between the OH byproduct and alkenes. After a short reaction time of 25-200 ms, the initial products, both free radical intermediates and stable species, are sampled into a molecular beam and directly detected by tunable synchrotron photoionization coupled with mass spectrometry. Mass and photoionization efficiency spectra of the initial products are obtained and theoretical calculations are also carried out to identify the products. General trends in the mass spectra and reaction mechanisms are discussed.

Photoionization efficiency spectra and theoretical study of initial intermediates of ozone and alkene reactions

243rd National Meeting (2012)

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