Friday, March 23, 2018 - 12:00pm
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100F Pierce Hall, 29 Oxford St., Cambridge

Atmospheric & Environmental Chemistry Seminar

"Chemical Mechanism Development for the Formation of Components of Secondary Organic Aerosol" with Matt Elrod, Oberlin College.

Extensive field and laboratory studies of secondary organic aerosol (SOA) formation have identified epoxide and lactone gas phase oxidation intermediates as key species in the formation of isoprene-derived SOA. SOA species are formed from isomerization and nucleophilic addition reactions of these intermediates with common SOA nucleophiles (such as water and sulfate). In this presentation, experimental laboratory kinetics data will be used to ascertain the structure-reactivity relationships that rationalize the mechanistic details for a variety of systems, including isoprene-derived epoxides (IEPOX), a methacrolein-derived epoxide (MAE), and a methacrolein-derived lactone (HMML). Substituent effects are used to rationalize the differing nucleophilic addition mechanisms and reaction rate constants, and a nucleophilicity scale is developed to explain product formation observations under conditions in which two or more nucleophiles are present. These frameworks serve as a basis for predicting the SOA reactivity of as-of-yet unidentified epoxides and lactones in the presence of the variety of nucleophiles known to exist on SOA.

Contact Name: 

Kelvin Bates

Research Areas: 

Harvard University
Center for the Environment

Address: 26 Oxford Street, 4th Floor, Cambridge
Phone: (617) 495-0368

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