Photoelectric Properties of Composite Surfaces at Various Temperatures and Potentials

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Abstract
Experiments designed to determine the variation of photoelectric current with temperature and plate potential for barium photoelectric cells are described. The technique used in making the cells is also given. A new method, employing interrupted illumination, a transformer coupled amplifier and a cathode ray oscillography, is developed for measuring the photoelectric current. In this way the thermionic current and currents of slow responses are completely eliminated and only the a.c. component of the photo-current is amplified.