Abstract
Resonant Raman scattering and photoinduced absorption of infrared active vibrations in poly(isothianaphthene) are reported. The data are analysed by the amplitude mode model taking into account the reduction of the thiophene backbone bond length alteration due to the benzene rings. We have found for poly(isothianaphthene) a renormalized vibrational force constant similar to that of polythiophene. We show that this result is compatible with both the small band gap and the reduced effective π-bandwidth.
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