droplet
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True/False
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When a positively-charged water droplet reaches the Rayleigh limit, positive ions will be emitted from the particles.
The emission of an ion from a droplet occurs only when the electric field strength at the droplet surface is of a critical value E*. Once an ion emits from the droplet, the electric-field strength at the surface decreases, which prevents further ion emission until the electric field again increases, by neutral solvent evaporation, to E*. Ion emission and solvent evaporation both occur almost concurrently on rapid time scales, such that the electric-field strength at the droplet surface remains approximately constant and close to E* as the droplet grows smaller.
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