AAAR 37th Annual Conference October 14 - October 18, 2019 Oregon Convention Center Portland, Oregon, USA
Abstract View
Multiphase Reaction Mechanisms of Criegee Intermediates in Indoor Environments
KEVIN WILSON, Lawrence Berkeley National Laboratory
Abstract Number: 100 Working Group: The Air We Breathe: Indoor Aerosol Sources and Chemistry
Abstract Developing molecular predictions of how oxidants react with unsaturated hydrocarbons in organic aerosols and at indoor surfaces remains a considerable challenge. Recent work has focused on developing predictive O3 and OH multiphase reaction mechanisms of simple alkene surfaces (e.g. squalene). Our goal is to understand how individual elementary reaction steps of radical and Criegee intermediates (CI) in turn drive macroscopic changes at an interface (i.e. chemical erosion). To do this we combine kinetic simulations with vacuum ultraviolet (VUV) photoionization aerosol mass spectrometry and nanoparticle X-ray photoelectron and absorption spectroscopies. I will describe how condensed phase CI’s react with trace gases such as H2O and SO2 to drive both chemical erosion and the production of reactive gas phase species. I will highlight key differences and similarities between heterogeneous reactions of OH vs. O3 at squalene interfaces.