Abstract
Abstract Fluorescence spectra of various condensed ring compounds have been studied in various solvents at room temperature. The positions and intensities of the 0,0-bands of the fluorescence spectra were seen to depend on the concentration of the solutions and, especially, the 0,0-bands for anthracene, phenanthrene and two isomers of benzoquinoline agreed well with those of the absorption spectra when sample solutions were highly diluted. On the other hand, no agreement was found for the 0,0-bands of the fluorescence and absorption spectra of long molecules, such as trans -stilbcno, trans , trans -diphenyloctatetraene, biphenyl and p -terphenyl, even at a very low concentration.
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