Abstract
A simple method for correcting the photoconductivity excitation spectrum is suggested. The method consists of illuminating the entrance slit by the light of a standard tungsten lamp run at a known colour temperature (2080 K in the present investigation) reflected from a MgO screen placed at an angle and recording the reflected light with the photomultiplier tube. The sensitivity factor is determined from the ratio of observed photomultiplier response and the intensity at different wavenumbers calculated from Planck's law for the colour temperature and multiplying by the reflectivity of MgO in the visible region. The spectrum of CdS agrees accurately with results reported previously.
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