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- W2068606727 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.Experimental results. With constant plate voltage the photoelectric current increases gradually with temperature and at about 600ifmmode^circelsetextdegreefi{}C is nearly twice as large as the current at room temperature. As the temperature however is raised from 600ifmmode^circelsetextdegreefi{}C to 750ifmmode^circelsetextdegreefi{}C the increase in photoelectric current for steady illumination is 100-fold while for interrupted illumination it is only 17-fold. The smaller increase in the latter case may be explained in view of the elimination of all sluggish currents produced by light in some secondary way. While the two curves for steady and interrupted illumination are similar in appearance, the latter has a maximum at 560ifmmode^circelsetextdegreefi{}C which resembles very much a resonance peak.The increase or decrease in photoelectric sensitivity with temperature for composite surfaces consisting of barium and oxygen on platinum may be explained by the diffusion of barium or oxygen on the surface. The increase in saturation voltage of the potential-current curves with temperature may likewise be explained by an increase in the contact potential brought about by a change in the work function." @default.
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- W2068606727 date "1931-04-15" @default.
- W2068606727 modified "2023-10-18" @default.
- W2068606727 title "Photoelectric Properties of Composite Surfaces at Various Temperatures and Potentials" @default.
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- W2068606727 doi "https://doi.org/10.1103/physrev.37.884" @default.
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