Disorder in Polyacetylene Probed By Resonant Raman Scattering
We describe a novel approach to experimentally quantify the effect of disorder in polymers using the dispersion of the resonant Raman scattering phonon frequencies with the excitation laser frequency. The method is applied to polyacetylene where two types of disorder are identified. For all-trans samples we found intrinsic disorder which results from variation in the coupling parameter. For cis rich trans samples the disorder is extrinsic and reflects breaking of the ground state degeneracy.
KeywordsConjugation Length Intrinsic Disorder Ground State Degeneracy Resonant Raman Scattering Neutral Soliton
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