We report detailed photoinduced and doping-induced absorption spectra of poly(3-methylthienylene) (P3MT) in the infrared-frequency range. The four infrared-active translational (T) modes of bipolarons and the weak-ring (R) modes associated with the ring deformation were observed, as in polythiophene (PT). Detailed analysis based on the amplitude-mode formalism shows that the nondegenerate ground state leads to an ``extrinsic'' contribution to the energy gap of 0.26 eV in P3MT, and that the pinning is weaker than in PT.
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Kim et al. (1987) studied this question.
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