Abstract
An account is given of measurements relating to the temperature dependence of the photoemission of muhialkali cathodes at temperatures in the region of 80 °K. These measurements show intensity-dependent and spectrally dependent non-linearities with hysteresis in which pronounced discontinuities of the quantum yield of the photoemission occur up to a factor of 2. With a temperature constancy in the region of ±0.01 °K these discontinuities are fully reproducible. Because of the extremely high temperature sensitivity of the effect interesting prospects are afforded when it is used for detecting thermal radiation on the basis of photoelectrons that can be utilized particularly well technically.
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