Homogeneous condensation, freezing nucleation rate measurement for small water droplets in an expansion cloud chamber

Experimental data on ice nucleation, presented in an earlier paper, are analyzed to yield information concerning the homogeneous nucleation rate of ice from supercooled liquid and the heights of energy barriers to that nucleation. The experiment consisted of using an expansion cloud chamber to nucle...

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Published in:Journal of the atmospheric sciences 1981-01, Vol.38 (6), p.1236-1243
Main Authors: Hagen, Donald E, Anderson, Rodney J, Kassner, James L
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Anderson, Rodney J
Kassner, James L
description Experimental data on ice nucleation, presented in an earlier paper, are analyzed to yield information concerning the homogeneous nucleation rate of ice from supercooled liquid and the heights of energy barriers to that nucleation. The experiment consisted of using an expansion cloud chamber to nucleate from the vapor a cloud of supercooled pure water drops and the observation of the fraction of drops that subsequently froze. The analysis used the standard classical homogeneous nucleation theory. The data are used to extract the first experimental measurement (albeit indirect) of the activation energy for the transfer of a water molecule across the liquid-ice interface at temperatures near -40 degrees C. The results provide additional evidence that the local liquid structure becomes more icelike as the temperature is lowered.
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title Homogeneous condensation, freezing nucleation rate measurement for small water droplets in an expansion cloud chamber
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