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- W2149501021 abstract "Electronic structures of quinquethiophene (5T) and sexithiophene (6T) polycrystalline films deposited by evaporation on gold substrates were studied by high resolution electron energy loss spectroscopy (HREELS). Vibrational spectra were compared to infrared spectroscopy and Raman scattering results. They reveal that surfaces are not rough and are free from contaminants. Energy gap values of 2.38±0.02 and 2.27±0.02 eV for 5T and 6T films, respectively, were evaluated from electronic spectra. Comparison with optical spectroscopy enabled the assignment of losses corresponding to optically allowed and forbidden transitions. Some of the latter ones located at 1.2, 1.7 and 2.0 eV were observed in 5T films and were assigned to S0→Tn transitions. Differential cross section analysis reveals the presence of resonance processes in the excitation mechanism. Ionization potentials were estimated to be 4.7±0.5 eV for both films." @default.
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- W2149501021 date "1998-08-01" @default.
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- W2149501021 title "Characterization of oligothiophene films by high resolution electron energy loss spectroscopy" @default.
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- W2149501021 doi "https://doi.org/10.1016/s0040-6090(98)00639-7" @default.
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