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A comparison is made between the π-electron transitions in the benzene molecule and its mono- and di-valent ions following the a.s.m.o.-treatment of Pariser and Parr. Starting from this theoretical treatment the experimental spectra of the molecules and negative ions of coronene and triphenylene have been interpreted. The locations of the absorption bands are in good agreement with the theoretical expectations; the intensity rules, however, are strongly violated. This divergence between theory and experiment is probably due to a Jahn-Teller distortion.
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G. J. Hoijtink (1959) studied this question.
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