Articles | Volume 20, issue 20
Atmos. Chem. Phys., 20, 11809–11821, 2020
https://doi.org/10.5194/acp-20-11809-2020
Atmos. Chem. Phys., 20, 11809–11821, 2020
https://doi.org/10.5194/acp-20-11809-2020
Research article
20 Oct 2020
Research article | 20 Oct 2020

Molecular understanding of the suppression of new-particle formation by isoprene

Martin Heinritzi et al.

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Short summary
With experiments performed at CLOUD, we show how isoprene interferes in monoterpene oxidation via RO2 termination at atmospherically relevant concentrations. This interference shifts the distribution of highly oxygenated organic molecules (HOMs) away from C20 class dimers towards C15 class dimers, which subsequently reduces both biogenic nucleation and early growth rates. Our results may help to understand the absence of new-particle formation in isoprene-rich environments.
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