Abstract

The first part of the paper reviews the work of E. A. Kirillov and co-workers, in which they have reported the existence of a pronounced fine structure in the absorption spectrum of weakly colored emulsion layers and a variety of other silver-containing systems. These authors conclude that this fine structure is characteristic of small aggregates of silver. The second part of the present paper summarizes attempts in these Laboratories to observe this fine structure in the spectrum of exposed Lippmann emulsions and in silver hydrosols. No structure has been observed. These results indicate that the absorption spectrum of small aggregates of silver does not necessarily exhibit the general features reported by Kirillov.

© 1961 Optical Society of America

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