Articles | Volume 24, issue 7
https://doi.org/10.5194/acp-24-3989-2024
https://doi.org/10.5194/acp-24-3989-2024
Research article
 | 
03 Apr 2024
Research article |  | 03 Apr 2024

Molecular-level study on the role of methanesulfonic acid in iodine oxoacid nucleation

Jing Li, Nan Wu, Biwu Chu, An Ning, and Xiuhui Zhang

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This preprint is open for discussion and under review for Atmospheric Chemistry and Physics (ACP).
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Cited articles

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Baccarini, A., Karlsson, L., Dommen, J., Duplessis, P., Vullers, J., Brooks, I. M., Saiz-Lopez, A., Salter, M., Tjernstrom, M., Baltensperger, U., Zieger, P., and Schmale, J.: Frequent new particle formation over the high Arctic pack ice by enhanced iodine emissions, Nat. Commun., 11, 4924, https://doi.org/10.1038/s41467-020-18551-0, 2020. 
Berresheim, H., Elste, T., Rosman, K., Dal Maso, M., Tremmel, H. G., Mäkelä, J. M., Allen, A. G., Kulmala, M., and Hansson, H.-C.: Gas-aerosol relationships of H2SO4, MSA, and OH: Observations in the coastal marine boundary layer at Mace Head, Ireland, J. Geophys. Res.-Atmos., 107, PAR 5-1–PAR 5-12, https://doi.org/10.1029/2000jd000229, 2002. 
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Iodic acid (HIO3) nucleates with iodous acid (HIO2) efficiently in marine areas; however, whether methanesulfonic acid (MSA) can synergistically participate in the HIO3–HIO2-based nucleation is unclear. We provide molecular-level evidence that MSA can efficiently promote the formation of HIO3–HIO2-based clusters using a theoretical approach. The proposed MSA-enhanced iodine nucleation mechanism may help us to deeply understand marine new particle formation events with bursts of iodine particles.
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