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Issue 25, 2018
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The role of nitric acid in atmospheric new particle formation

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Abstract

Nitric acid, an air pollutant with strong acidity and oxidizability, can be found in considerable quantities in the gas and aerosol phase. Understanding the role of nitric acid in atmospheric new particle formation is essential to study the complicated nucleation mechanism. Using density functional theory combined with the Atmospheric Clusters Dynamic Code (ACDC), the role of nitric acid in the formation of new particles has been investigated under different atmospheric conditions (different precursor concentrations and temperatures). The results show that nitric acid can form clusters with sulfuric acid and ammonia by hydrogen bond or even proton-transfer interactions. The concentrations of clusters involving nitric acid can be comparable with those of sulfuric acid–ammonia-based clusters, considering the thermodynamic stability combined with the realistic atmospheric concentrations of precursors. Within the atmospheric concentration range, nitric acid can enhance the formation rates of sulfuric acid–ammonia clusters, especially at low temperature, low sulfuric acid concentration and high ammonia concentration. In addition, the new particle formation mechanism indicates that nitric acid can contribute to the cluster formation and the role of nitric acid in the cluster formation pathway is as a “bridge” connecting the smaller and larger clusters.

Graphical abstract: The role of nitric acid in atmospheric new particle formation

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Supplementary files

Article information


Submitted
28 Apr 2018
Accepted
30 May 2018
First published
30 May 2018

Phys. Chem. Chem. Phys., 2018,20, 17406-17414
Article type
Paper

The role of nitric acid in atmospheric new particle formation

L. Liu, H. Li, H. Zhang, J. Zhong, Y. Bai, M. Ge, Z. Li, Y. Chen and X. Zhang, Phys. Chem. Chem. Phys., 2018, 20, 17406
DOI: 10.1039/C8CP02719F

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