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Emission of Light by Kanal-strahlen Normal to their Direction

Abstract

IN a former publication (Physik. Zeitschrift, vi., 892, 1905) I have proved that the stream of positive ions which form the Kanal-strahlen show the Doppler effect. In these rays we have, therefore, a positive charge, and at the same time velocity, and also, as a result of the vibrations of the negative electrons, emission of light. Therefore it is exerting a pressure on the ions against the translation resulting from radiation; besides this force an electromagnetic force—of second order of the ratio of velocity of translation to velocity of light—may arise from the moved charges of the ions and act on the vibrating electrons. The experimental research of the light of Kanal-strahlen emitted normally to their direction has given the following results. The observations have been made on hydrogen; the velocity of the Kanal-strahlen was 0.9.108 and 1.2.108 cm. sec.-1. The spectrograms were taken with a prism-spectrograph and with a concave grating of 1 metre radius.

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STARK, J. Emission of Light by Kanal-strahlen Normal to their Direction. Nature 73, 389–390 (1906). https://doi.org/10.1038/073389d0

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