The resonance Raman effect of trans polyacetylene is described in terms of a photoselective resonance scattering from a distribution of conjugation lengths. Higher excited states of the π-π*-transition are included and very good agreement with experimental results is obtained with respect to scattering intensity and line width if a strong in-homogenious broadening of the vibronic oscillator is assumed. For a high quality sample 85 % of the polymer is in segments longer than 20 double bonds. Application of the model to isomerization and electrochemical doping shows that both processes start in the highly disordered areas.
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Kuzmany et al. (1985) studied this question.
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