Optical absorption spectra in the range 5×104- 400 cm−1 and Raman spectra are studied in polypyrrole, as function 1) of the sample preparation; 2) of the temperature (10-300 K) and 3) of the nature of dopant counterions (BF4, SO4, ClO4, NO3).
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Oddi et al. (1985) studied this question.
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