Atmospheric Chemistry and Physics
Atmospheric Chemistry and Physics
ACP
Articles | Volume 26, issue 16
Articles | Volume 26, issue 16
https://doi.org/10.5194/acp-26-12183-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-26-12183-2026
© Author(s) 2026. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 26, issue 16
Research article
 | 
28 Aug 2026
Research article |  | 28 Aug 2026

In situ real-time determination of SO2 photochemical oxidation in nanoscale sea salt aerosols based on dark-field microscopy

Xijie Xiong, Zhibo Xie, Xiuli Wei, Douguo Zhang, Jianguo Liu, and Huaqiao Gui

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Short summary
Using dark-field microscopy, we observed in situ reactions between individual sodium chloride nanoparticles and sulfur dioxide under ultraviolet irradiation. We found that reaction rates depended on particle size strongly and nonlinearly, with this behavior likely driven by the competition between surface curvature and specific surface area effects. This interpretation was further confirmed through transition state theory calculations and experimental modification of particle surface area.
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