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Highly resolved emission and excitation spectra of phenalenyl are reported. Our semiempirical calculations predict E″ symmetry for the lowest excited state. Indeed, Jahn-Teller effects are observed. Force field calculations have been performed to determine the symmetries of vibrations visible in the spectra. The Jahn-Teller coupling is analysed with a scheme of Sloane and Silbey.
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Cofino et al. (1984) studied this question.
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