Abstract
THE photoconductive properties of lead sulphide when irradiated by wave-lengths between 1 and 3.5 µ were first utilized as a means of detecting infra-red radiation during the War by the Germans. In the later stages, lead sulphide detector cells were developed by the Admiralty1 and in the United States2, for within their range of operation they are far superior to any other detector in speed and sensitivity. The purpose of the present note is to indicate their possibilities as a tool in infra-red spectroscopy, and to describe some of our results in applying them to the attainment of high resolving power in the near infra-red region of the spectrum. The cells used by us were made at the Admiralty Research Laboratory by the evaporation process, and were cooled to a temperature of about – 78° C. by a mixture of solid carbon dioxide and acetone.
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