Abstract
KLEIN and Rosseland deduced from thermodynamical considerations that an excited atom can, in consequence of a collision, fall into the normal state without emission of radiation (impact of the second kind). A part of the energy that becomes free can be spent in exciting the other atom, giving rise to the phenomenon of the “activated fluorescence” which was found to occur in mixtures of metallic vapours by Franck and his school.
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RASETTI, F. Activated Fluorescence and Doppler Effect. Nature 118, 47 (1926). https://doi.org/10.1038/118047a0
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DOI: https://doi.org/10.1038/118047a0
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