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In experiments where ultraviolet light produces aerosols from trace amountsof ozone, sulphur dioxide, and water vapour, the number of additional smallparticles produced by ionization by gamma sources all grow up to diameterslarger than 50 nm, appropriate for cloud condensation nuclei. This resultcontradicts both ion-free control experiments and also theoretical models thatpredict a decline in the response of larger particles due to an insufficiencyof condensable gases (which leads to slower growth) and to larger losses bycoagulation between the particles. This unpredicted experimental finding pointsto a process not included in current theoretical models, possibly anion-induced formation of sulphuric acid in small clusters.

Response of Cloud Condensation Nuclei (> 50 nm) to changes in ion-nucleation