The Frank-Condon approach for resonance Raman scattering and optical absorption was used to explain the dispersion effect for the C=C stretch mode in trans-(CH)ₓ quantitatively. The results are consistent with disturbed and undisturbed areas in the polymer. The Frank-Condon electron-phonon coupling constant was found 3.9 eV/{}, and the anomalous broad resonance cross section is interpreted as uncertainty broadening due to soliton-antisoliton generation from excited electron-hole pairs.
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Kuzmany et al. (1982) studied this question.
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