Abstract
We have investigated and developed a reliable method to produce uniformly charged liquid nitrogen drops. An apparatus has been built which is capable of producing and charging drops in the 200 μ diameter range. Rayleigh’s method of uniform droplet production, which consists of breaking up a smooth liquid jet into uniform drops by an acoustic wave, is used. The diameter of the drops is controlled by the inside diameter of the nozzle and the frequency of the acoustic wave. Charges injected into the jet through field emission or field ionization subsequently end up on the drops, thereby producing uniformly charged drops. The charge per drop is determined by the amount of charge injected into the jet and by the number of drops produced per second. The maximum charge which could be placed on a single drop without impairing its integrity was one-fifth of its Rayleigh limit. The method described here could be applied to other insulating cryogenic liquids such as liquid hydrogen.
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