Effects of Crystal Surface on the Optical Absorption Edge of AgBr

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Abstract
The absorption edge (380-500 mμ) of AgBr was investigated with fine-grain suspensions in water. When the small amount of Rayleigh scattering was subtracted, the absorption coefficient was calculated from the remaining specular density. Comparison of crystals of about 65 Å radius with bulk material showed that the absorption coefficient was only about half as great, and the temperature dependence and iodide shift appeared to be somewhat smaller. It is not certain whether the decreased absorption is better explained as the result of distortions of the conduction and valence bands near the crystal surface, or of changes in the phonon spectrum caused by the crystal boundaries.

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