Molecular dynamics simulation is carried out to investigate ion-induced nucleation in water vapor. Comparison is made between ions with similar size and opposite electric charge, a potassium ion and a chloride ion. At large supersaturation ratios, no qualitative difference is discernible in clustering dynamics. At a small supersaturation ratio, clustering around the cation stops at a size ～12, while clustering around the anion continues. The molecular structure of ion clusters explains the difference.
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