Abstract
Vapour phase and solution spectra of pyrrole and three of its derivatives were investigated in the near UV region. Band systems disappearing from the solution spectra could be assigned to Rydberg transitions if the band profiles were compared with those of the corresponding UPS bands and with other Rydbergs of the same molecule. In the case of each compound, four Rydbergs originating from the uppermost π orbital were found, terminating at 3 s, 3 p and 3 p′, 3 d Rydberg orbitals.
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