Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 8 4 2008 10.5194/acpd-8-16609-2008 http://www.atmos-chem-phys-discuss.net/8/16609/2008/ http://www.atmos-chem-phys-discuss.net/8/16609/2008/acpd-8-16609-2008.html http://www.atmos-chem-phys-discuss.net/8/16609/2008/acpd-8-16609-2008.pdf 16609 16641 2008-09-01 Negatively charged nanoparticles produced by splashing of water H. Tammet hannes.tammet@ut.ee U. Hõrrak M. Kulmala Institute of Physics, University of Tartu, Ãœlikooli 18, 50090 Tartu, Estonia Department of Physical Sciences, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland The production of splashing-generated balloelectric intermediate ions was studied by means of mobility spectrometry in the atmosphere during the rain and in a laboratory experiment simulating the heavy rain. The partial neutralization of intermediate ions with cluster ions generated by beta rays suppressed the space charge of intermediate ions but preserved the shape of the mobility distribution. The balloelectric ions produced from the waterworks water of high TDS (Total Dissolved Solids) had about the same mobilities as the ions produced from the rainwater of low TDS. This suggests that the balloelectric ions can be considered as singly charged water nanodroplets. By different measurements, the diameter mode of these droplets was 2.2–2.7 nm, which is close to the diameter of 2.5 nm of the Chaplin's 280-molecule magic icosahedron superclusters. The measurements can be explained by a hypothesis that the pressure of saturated vapor over the nanodroplet surface is suppressed by a number of magnitudes due to the internal structure of the droplets near the size of 2.5 nm. 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