<strong>Heterogeneous reactions of gaseous ozone with aqueous sesquiterpenes: The roles of Criegee intermediates</strong>

Shinichi Enami; AJ Colussi

Presentation information

[JJ] Oral

A (Atmospheric and Hydrospheric Sciences) » A-AS Atmospheric Sciences, Meteorology & Atmospheric Environment

[A-AS11] [JJ] Atmospheric Chemistry

Wed. May 24, 2017 1:45 PM - 3:15 PM 301B (International Conference Hall 3F)

convener:Hitoshi Irie(Center for Environmental Remote Sensing, Chiba University), Toshinobu Machida(National Institute for Environmental Studies), Hiroshi Tanimoto(National Institute for Environmental Studies), Yoko Iwamoto(Graduate School of Biosphere Science, Hiroshima University), Chairperson:Sachiko Okamoto(National Institute for Environmental Studies), Chairperson:Yugo Kanaya(Department of Environmental Geochemical Cycle Research, Japan Agency for Marine-Earth Science and Technology)

2:15 PM - 2:30 PM

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

*Shinichi Enami¹, AJ Colussi² (1.National Institute for Environmental Studies, Japan, 2.Caltech)

Keywords: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.