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The He(I) photoelectron spectrum of indigo has been obtained by evaporating the compound at ca. 400°C. The ionization potentials are related to orbital energies or electronic states of the radical cation with the aid of semi‐empirical SCF‐MO calculations. A satisfactory interpretation of the spectrum up to 18 eV is obtained according to the HAM/3 method.
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Rademacher et al. (1992) studied this question.
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