Abstract
A vacuum grating monochromator is described, suitable for photoelectric research in the Schumann region. A hydrogen discharge tube serves as a light source, and radiation intensities are measured with a potassium photo-cell and fluorescent filter. Photo-currents are measured with a Compton electrometer, using the steady deflection method. The photoelectric yield of cadmium has been measured from the threshold to 1000A, and curves are given showing a maximum for the surface effect and the onset of the volume effect.
© 1938 Optical Society of America
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