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Differences between the Franck-Condon frequencies for emission and absorption are calculated for butadiene, naphthalene and anthracene. The molecular-orbital method is used and its validity in the present case is discussed. A correlation with the experimental data has been attempted for anthracene and appears to be satisfactory. It is shown that the calculated values may be correlated qualitatively with the fluorescence efficiencies of the molecules.
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S. L. Altmann (1950) studied this question.
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