Abstract
THE study of the fluorescence of organic substances has shown that strong fluorescence is almost entirely confined to conjugated ring systems, which possess the highly mobile electrons. Theoretically, it is clear that a substance can only then exhibit fluorescence if the potential curves of the ground state and the excited state do notcross each other (or come very near to each other) so that the transformation of electronic excitation energy into heat cannot occur.
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References
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WEISS, J. Fluorescence and Oxidation in Conjugated Ring Systems. Nature 145, 744–745 (1940). https://doi.org/10.1038/145744b0
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DOI: https://doi.org/10.1038/145744b0
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