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Resonance Raman Spectra and Electronic Transitions in Carotenoids: A Density Functional Theory Study
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    Resonance Raman Spectra and Electronic Transitions in Carotenoids: A Density Functional Theory Study
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    Theoretical Physics Department, Faculty of Physics, Vilnius University, Saulėtekio al. 9, LT-10222 Vilnius, Lithuania
    Center for Physical Sciences and Technology, A. Gostauto 11, LT-01108 Vilnius, Lithuania
    § Institut de Biologie et de Technologie de Saclay, CEA, UMR 8221 CNRS, University Paris Sud, CEA Saclay, 91191 Gif sur Yvette, Paris, France
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    The Journal of Physical Chemistry A

    Cite this: J. Phys. Chem. A 2014, 118, 10, 1817–1825
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    https://doi.org/10.1021/jp406449c
    Published February 15, 2014
    Copyright © 2014 American Chemical Society

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    Raman and electronic absorption spectra corresponding to the S0–S2 electronic transition of various carotenoid and polyene molecules are theoretically analyzed using the density functional theory (DFT) approach. The results demonstrate the linear dependence between the frequency of the so-called ν1 band corresponding to the C═C stretching modes in the Raman spectra and the S0–S2 electronic transition for molecules of different conjugation lengths. From these calculations the following relationship have been identified: (i) the effective conjugation length shortens in conformers of carotenoids containing β-rings whereas it increases in polyene upon s-cis isomerization at their ends, (ii) methyl groups connected to the conjugated chain of carotenoids induce a splitting of the ν1 band in the Raman spectra, (iii) the effective conjugation lengths of all-trans-polyenes and corresponding all-trans-carotenoids are the same as follows from the Raman ν1 frequency, but they are different as defined from S0–S2 electronic transition energies. The results well correlate with the experimental observations.

    Copyright © 2014 American Chemical Society

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    The Journal of Physical Chemistry A

    Cite this: J. Phys. Chem. A 2014, 118, 10, 1817–1825
    Click to copy citationCitation copied!
    https://doi.org/10.1021/jp406449c
    Published February 15, 2014
    Copyright © 2014 American Chemical Society

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