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The energy of the first excited levels of benzene is calculated by the method of antisymmetrized molecular orbitals. The results predict two weak bands, due to forbidden electronic transitions, at λ = 2500 and λ = 2100 and a strong band at λ = 1500. No empirical data except the carbon-carbon distance in benzene were used.
Goeppert-Mayer et al. (1938) studied this question.