The amplitude mode approach for describing the resonant raman scattering in dimerized chains is reviewed and applied to the polyacetylene system. trans-(CH)x is disordered with a variable electron-phonon coupling constant. cis-(CH) x is ordered with an extrinsic gap of ∼ 5% of the full gap. A distribution of extrinsic gaps is shown to exist In trans-(CH) x chains in partially isomerized polyacetylene.
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Ehrenfreund et al. (1985) studied this question.
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