Numbers Theory for Lead Sulfide Photoconducting Films

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Abstract
This communication comments on some of the work of Fleming and Alberg, and presents some data tending to substantiate a ``numbers'' theory for photoconduction in certain types of chemically prepared photoconducting films of lead sulfide. The data were obtained some years ago but were not published, and were taken during an extensive program of measurements of the basic properties of PbS films, some of the results of which were published [G. W. Mahlman, Phys. Rev. 103, 1619 (1956); J. C. Slater, ibid. 103, 1631 (1956)].