Abstract
Ions enhance the formation rate of atmospheric aerosol particles, which play an important role in Earth’s radiative balance. Ion-induced nucleation involves the stepwise accretion of neutral monomers onto a molecular cluster containing an ion, which helps to stabilize the cluster against evaporation. Although theoretical frameworks exist to calculate the collision rate coefficients between neutral molecules and ions, they need to be experimentally confirmed, ideally under atmospherically relevant conditions of around 1000 ion pairs cm−3. Here, in experiments performed under atmospheric conditions in the CERN CLOUD chamber, we have measured the collision rate coefficients between neutral iodic acid (HIO3) monomers and charged iodic acid molecular clusters containing up to 11 iodine atoms. Three methods were analytically derived to calculate ion-polar molecule collision rate coefficients. After evaluation with a kinetic model, the 50% appearance time method is found to be the most robust. The measured collision rate coefficient, averaged over all iodine clusters, is (2.4 ± 0.8)×10−9cm3 s−1, which is close to the expectation from the surface charge capture theory.
Original language | English |
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Pages (from-to) | 231-242 |
Number of pages | 12 |
Journal | Aerosol Science and Technology |
Volume | 55 |
Issue number | 2 |
Early online date | 2020 |
DOIs | |
Publication status | Published - 2021 |
Publication type | A1 Journal article-refereed |
Keywords
- Jingkun Jiang
Publication forum classification
- Publication forum level 1
ASJC Scopus subject areas
- Environmental Chemistry
- General Materials Science
- Pollution