Abstract
DR. B. GUDDEN and Prof. R. Pohl, in-the Zeitschrift fur Physik, January 24, 1924, give the results of further experiments made by them on the phosphores, with their views as to the theory of the subject. Lenard and his school are of the opinion that the conductivity produced by the action of light in phosphores is not connected with the production of phosphorescence, and that their emission of light has nothing to do with their conductivity. Gudden and Pohl, however, in 1920 showed that, there is a close connexion in both cases, and came to the conclusion that, both in excitation and emission, there is really a spatial rearrangement of electrons, which implies a flow of current while the change is taking place.
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