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Issue 29, 2008
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Mechanisms for the formation of secondary organic aerosol components from the gas-phase ozonolysis of α-pinene

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Abstract

Gas-phase ozonolysis of α-pinene was studied in static chamber experiments under ‘OH-free’ conditions. A range of multifunctional products—in particular low-volatility carboxylic acids—were identified in the condensed phase using gas chromatography coupled to mass spectrometry after derivatisation. The dependence of product yields on reaction conditions (humidity, choice of OH radical scavengers, added Criegee intermediate scavengers, NO2etc.) was investigated to probe the mechanisms of formation of these products; additional information was obtained by studying the ozonolysis of an enal and an enone derived from α-pinene. On the basis of experimental findings, previously suggested mechanisms were evaluated and detailed gas-phase mechanisms were developed to explain the observed product formation. Atmospheric implications of this work are discussed.

Graphical abstract: Mechanisms for the formation of secondary organic aerosol components from the gas-phase ozonolysis of α-pinene

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Supplementary files

Article information


Submitted
26 Feb 2008
Accepted
24 Apr 2008
First published
06 Jun 2008

Phys. Chem. Chem. Phys., 2008,10, 4294-4312
Article type
Paper

Mechanisms for the formation of secondary organic aerosol components from the gas-phase ozonolysis of α-pinene

Y. Ma, A. T. Russell and G. Marston, Phys. Chem. Chem. Phys., 2008, 10, 4294
DOI: 10.1039/B803283A

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