Abstract
ANTHRACENE crystals usually take the form of thin plates, and in ultra-violet light their fluorescence seems concentrated at the edges. This is because much of the fluorescence is unable to escape through the large flat surfaces, and undergoes numerous reflexions within the thin layer, emerging at the narrow faces. A part of the fluorescence light, therefore, travels very much farther through the material than it would if it could escape equally in all directions, and the effect of overlap of absorption and fluorescence bands is thereby greatly exaggerated. The shorter-wave side of the fluorescence band is weakened by reabsorption and energy degradation.
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References
Bowen, E. J., and Mikiewicz, E., and Smith, F., Proc. Phys. Soc., A, 62, 26 (1949).
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BOWEN, E., LAWLEY, P. Crystal Size and Fluorescence Intensity. Nature 164, 572–573 (1949). https://doi.org/10.1038/164572b0
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DOI: https://doi.org/10.1038/164572b0
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