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Published 2006 | Published + Supplemental Material
Journal Article Open

Gas-phase products and secondary aerosol yields from the ozonolysis of ten different terpenes


The ozonolyses of six monoterpenes (α-pinene, β-pinene, 3-carene, terpinolene, α-terpinene, and myrcene), two sesquiterpenes (α-humulene and β-caryophyllene), and two oxygenated terpenes (methyl chavicol and linalool) were conducted individually in Teflon chambers to examine the gas-phase oxidation product and secondary organic aerosol (SOA) yields from these reactions. Particle size distribution and number concentration were monitored and allowed for the calculation of the SOA yield from each experiment, which ranged from 1 to 54%. A proton transfer reaction mass spectrometer (PTR-MS) was used to monitor the evolution of gas-phase products, identified by their mass to charge ratio (m/z). Several gas-phase oxidation products, formaldehyde, acetaldehyde, formic acid, acetone, acetic acid, and nopinone, were identified and calibrated. Aerosol yields, and the yields of these identified and calibrated oxidation products, as well as many higher m/z oxidation products observed with the PTR-MS, varied significantly between the different parent terpene compounds. The sum of measured oxidation products in the gas and particle phase ranged from 33 to 77% of the carbon in the reacted terpenes, suggesting there are still unmeasured products from these reactions. The observations of the higher molecular weight oxidation product ions provide evidence of previously unreported compounds and their temporal evolution in the smog chamber from multistep oxidation processes. Many of the observed ions, including m/z 111 and 113, have also been observed in ambient air above a Ponderosa pine forest canopy, and our results confirm they are consistent with products from terpene + O_3 reactions. Many of these products are stable on the timescale of our experiments and can therefore be monitored in field campaigns as evidence for ozone oxidative chemistry.

Additional Information

© 2006 American Geophysical Union. Received 29 June 2005; revised 14 November 2005; accepted 30 December 2005; published 5 April 2006. This material is based upon work supported by the National Science Foundation, under grants 0119510 and 0443448, and the California Air Resources Board (contract 00-732). A. Lee was supported by a Graduate Research Education Fellowship from the Department of Energy's Global Change Education Program. The Caltech Indoor Chamber Facility is supported by the U.S. Environmental Protection Agency Science to Achieve Results (STAR) Program, grant RD-83107501-0. The authors are grateful to Jesse H. Kroll for helpful discussions on oxidation mechanisms.

Attached Files

Published - 242-Lee-2006.pdf

Supplemental Material - jgrd12489-sup-0001-t01.txt

Supplemental Material - jgrd12489-sup-0002-t02.txt

Supplemental Material - jgrd12489-sup-0003-t03.txt

Supplemental Material - jgrd12489-sup-0004-t04.txt

Supplemental Material - jgrd12489-sup-0005-t05.txt


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August 19, 2023
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