[A-AS11] [JJ] 大気化学

[AAS11-27] Heterogeneous reactions of gaseous ozone with aqueous sesquiterpenes: The roles of Criegee intermediates

*江波 進一¹、Colussi AJ² (1.国立環境研究所、2.Caltech)

キーワード：Criegee, Terpenes, BVOC, ozone, surface, interface

We report the detection of intermediates/products generated on fresh surfaces of alpha-humulene and beta-caryophyllene solutions in water/acetonitrile mixtures exposed to gaseous ozone for ~ 10 microsecond. We focus on the identification of intermediates/products and their mechanisms of formation via negative ion online electrospray mass spectrometry complemented with the use of (1) H/D and ¹⁶O/¹⁸O isotopes, (2) a OH-radical scavenger, (3) variable O₃ number densities, and (4) n-alkyl carboxylic acid additions. We will discuss how our results provide direct evidence on the distinct reactivity of Criegee intermediates at air/aqueous interfaces.