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Absorption and CD spectra of the π‐π* transition near 200 nm are calculated for helical (Pro)n I and II (n = 6, 10) using the dipole interaction model, including interactions among all atoms, with optical parameters obtained from previous studies of related molecules. Calculated spectra for (Ala)n and (Pro)n in the same conformation show marked differences. The spectra for (Pro)n are sensitive to side‐chain structure but are found to agree reasonably well with exeriment for forms I and II when the side‐chain CC bond length is set at 1.54 Å, with structural data otherwise obtained from x‐ray diffraction studies.
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Jon Applequist (1981) studied this question.
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