Cooperative Institute for Research in Environmental Sciences at the University of Colorado Boulder

Analytical Chemistry Seminar: Lucas Algrim

Analytical & Environmental Chemistry Division and Atmospheric Chemistry Program Seminar

Jointly sponsored by the Department of Chemistry and Biochemistry, CIRES, and the Environmental Program

Effect of a Functional Group on SOA Yields and Particle Composition from OH Radical Initiated Reactions of Alkanes in the Presence of NOx

by Lucas Algrim - Department of Chemistry and Biochemistry, University of Colorado Boulder

In a series of laboratory experiments we have identified major products and determined SOA yields from the reactions of C10 alcohol and C12 ketone position-isomers with OH radicals in the presence of NOx.  Reactions were studied with a particle beam mass spectrometer (PBMS), gas chromatograph with flame ionization detection (GC-FID), and a scanning mobility particle sizer (SMPS), among other instruments.  Functional group position had a considerable effect on SOA yields, which is fully explainable by the fate of alkoxy radical intermediates and vapor pressures of resulting products.  Important observed differences from alkane chemistry were enhanced decomposition via α-cleavage, ability of the preexisting ketone to play a role in cyclic hemiacetal formation, and significantly hindered isomerization when the ketone was part of the transition-state ring.  


CIRES Fellows Room, Ekeley S274