Photolytic de‐activation of silver iodide as an ice‐forming nucleus

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Abstract
The rate at which the ice‐nucleating ability of silver iodide decays when irradiated with the equivalent of strong sunlight has been determined by measuring the density of oriented ice crystals appearing on single crystals of silver iodide after various periods of exposure to a mercury‐arc lamp. Wavelengths greater than 4,400 Å cause very little photolysis and decay of nucleation. The ice‐crystal density decreases 10‐ to 20‐fold after the silver iodide has been exposed to the equivalent of one hour's strong sunlight; this result is in fair agreement with the findings of the Australian workers where the activity of silver‐iodide smoke falls by 1 to 2 orders of magnitude after one hour in the atmosphere in sunlight.

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