Word Count : 243

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Fluorescence is a spectroscopic phenomenon in which a substance absorbs light at a certain wavelength and re-emits it at a longer wavelength. Several factors influence the intensity and efficiency of fluorescence. One major factor is the chemical structure of the molecule. Compounds with conjugated double bonds, aromatic rings, __________ __________ ___ _____ _____ _____ _______ ______.
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