Abstract
The excited singlet state spectrum of 1,4-diphenylnaphthalene (DPN) has been measured and analyzed in terms of theoretical calculations. The results show that there is significant geometrical rearrangement in DPN upon excitation and that consideration of this change in geometry is important in calculating the excited state spectrum. A new method is also suggested for selecting the configurations to be used in the excited state spectral calculation. Calculations using an expanded set of configurations ( S+ S *) provide a more consistent analysis of the experimental spectrum than those using only singly excited configurations ( S).
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