Abstract
It is shown that for photoconductive compounds the long wavelength `threshold' of sensitivity λ should be related to the refractive index n of the photoconductor, and analysis of the available data shows that for the more highly refractive compounds n4/λ always has a value close to 77. As a consequence of this relation, an explanation can be given for the change of the threshold wavelength with temperature which is observed for lead sulphide and similar materials. Suggestions are made as to what materials ought to be suitable for photoconductive detectors at longer wavelengths in the infra-red, and some confirmation of the ideas is shown by results obtained with cadmium arsenide, the properties of which are briefly described
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