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GROWTH OF SMALL IONS IN SUPERSATURATED WATER VAPOUR

Author
Hutton, P. J.
Published
United Kingdom : [publisher not identified], 1963.
[Oak Ridge, Tennessee] : [U.S. Atomic Energy Commission], 1963.
Physical Description
microfiche : negative ; 8 x 13 cm

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Summary
The growth of positive hydrogen ions during controlled exposures to water vapor was investigated experimentally. The ions were drawn by a uniform electric field across a jet of supersaturated vapor, formed by the expansion of saturated vapor through a nozzle. The distance they were swept downstream was found from the position of that electrode of a series which collected them. The time spent by the ions in the vapor was determined from this distance and the streaming velocity of the jet. From this exposure time and the field strength, and the pressure of vapor in the jet and its width, the mean mobility of the ions was calculated. Oswatitsch's theory of the rate of growth of droplets in a pure vapor is extended to the case of ions, by assuming that even a small ion in a vapor can be treated as a charged liquid droplet, and taking account of the influence of its charge on its collision frequency with vapor molecules. The ion's size is derived as a function of the product of exposure time and vapor pressure. Using Langevin's theory of mobility its mean mobility during the exposure is predicted. The predicted and measured mobilities agree, showing that the experimental results are consistent with the assumption that the ions grow by attaching single molecules. (auth)
Report Numbers
AWRE-0-55/63
Other Subject(s)
Collection
U.S. Atomic Energy Commission depository collection.
Note
NSA number: NSA-17-039018
OSTI Identifier 4628770
Research organization: United Kingdom Atomic Energy Authority. Weapons Group. Atomic Weapons Research Establishment, Aldermaston, Berks, England.
View MARC record | catkey: 38968179