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On the basis of a qualitative quantum mechanical theory of the energies and dipole strengths of the lower π-electronic transitions in alternant hydrocarbon molecules and their mono- and di-valent ions a comparison is made between the spectra in the 5–45 kK region of the molecules and ions of naphthalene, anthracene, tetracene, pyrene and perylene.
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Hoijtink et al. (1960) studied this question.
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