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- W2040256321 abstract "The emeraldine base form of polyaniline has been studied by photoinduced absorption (PA) spectroscopy and by light-induced electron spin resonance (LESR). The PA spectrum shows the presence of an induced bleaching at 2 eV, three photoinduced absorptions at 0.9, 1.4, and 3.0 eV, and an associated bleaching of the bandedge transition starting at 3.5 eV. The two induced absorptions at 1.4 and 3.0 eV are ascribed to the photogeneration of positive polarons. The origin of the “low energy” induced absorption at 0.9 eV is less certain, though it is possibly due to the formation of bipolarons or some other interchain species. Time-resolved studies of the exciton bleaching indicate that the excitons form within 10 ps or less after light strikes the polymer, and that their fast decay dynamics are independent of temperature. The measured LESR signal for pump light of energy ∼ 2.5 eV is consistent with the dissociation of some excitons into polarons." @default.
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- W2040256321 date "1989-03-01" @default.
- W2040256321 modified "2023-09-26" @default.
- W2040256321 title "Photoexcitations in emeraldine base" @default.
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- W2040256321 doi "https://doi.org/10.1016/0379-6779(89)90328-7" @default.
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