Heterogeneous nucleation probabilities for nucleation of n-propanol vapor on positive and negative ions around 1 nm electrical mobility diameter were experimentally determined using a fast expansion chamber. Ions were obtained from a 241Am bipolar diffusion charger and subsequently classified by means of a newly developed Differential Mobility Analyzer (DMA) especially designed for operation in the few nanometer and even subnanometer size range. Although positive and negative ions exhibit clearly different mobility diameters, the corresponding onset saturation ratios were found to be surprisingly similar.
Keywords Ion-induced nucleation, heterogeneous nucleation probability, DMA
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Winkler, P.M., Steiner, G.M., Reischl, G.P., Vrtala, A., Wagner, P.E., Kulmala, M. (2007). Experimental Observation of Heterogeneous Nucleation Probabilities for Ion-induced Nucleation. In: O'Dowd, C.D., Wagner, P.E. (eds) Nucleation and Atmospheric Aerosols. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-6475-3_74
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