Abstract
The paper studies vibronic spectra (exciton+intramolecular vibrational quanta) of helical polymers in solutions. The theoretical model employed here makes it possible to describe the ultraviolet (UV) absorption and circular dichroism (CD) spectra in the conditions of linear and quadratic exciton–phonon interaction. On the basis of the expanded Moffitt exciton model the structure of degenerate and nondegenerate one-phonon vibronic spectra containing one-particle and two-particle (unbound) exciton–phonon states is found. The frequencies and the shape of UV and CD spectral lines are calculated for typical values of the exciton–phonon interaction constants.
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