Abstract
Polarized Resonant Raman Scattering (RRS) spectra of trans (CH) x taken at different excitation wavelengths ( λ L=647 nm and 458 mm) have been recorded for oriented samples obtained by using a new catalyst for the synthesis. The experimental results display a similar behaviour to that of RRS spectra recently analyzed. In particular, the ‖ ‖ spectra at λ L=458 nm show two bands with a double peaked sufficiently well resolved structure, due to the contribution of long and short conjugation length segments. On the contrary, the |; ‖, ‖ |; , |; |; polarized spectra only display two structureless bands peaked at higher frequencies with respect to the previous ones. These results confirm the theoretical predictions. Oriented trans (CH) x doped with iodine have also been studied in polarized RRS. A detailed analysis of the band shapes and of the depolarization ratios shows differences with respect to the undoped trans (CH) x case in agreement with a modification upon doping of the bimodal chain length distribution.
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