Articles | Volume 16, issue 21
Atmos. Chem. Phys., 16, 13601–13618, 2016
https://doi.org/10.5194/acp-16-13601-2016

Special issue: The CERN CLOUD experiment (ACP/AMT inter-journal SI)

Atmos. Chem. Phys., 16, 13601–13618, 2016
https://doi.org/10.5194/acp-16-13601-2016

Research article 03 Nov 2016

Research article | 03 Nov 2016

Unexpectedly acidic nanoparticles formed in dimethylamine–ammonia–sulfuric-acid nucleation experiments at CLOUD

Michael J. Lawler et al.

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Latest update: 03 Mar 2021
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Short summary
We present chemical observations of newly formed particles as small as ~ 10 nm from new particle formation experiments using sulfuric acid, dimethylamine, ammonia, and water vapor as gas phase reactants. The nanoparticles were more acidic than expected based on thermodynamic expectations, particularly at the smallest measured sizes. The results suggest rapid surface conversion of SO2 to sulfate and show a marked composition change between 10 and 15 nm, possibly indicating a phase change.
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