Excited-State Dynamics of Overlapped Optically-Allowed 1Bu+ and Optically-Forbidden 1Bu− or 3Ag− Vibronic Levels of Carotenoids: Possible Roles in the Light-Harvesting Function

The unique excited-state properties of the overlapped (diabatic) optically-allowed 1Bu+ and the optically-forbidden 1Bu− or 3Ag− vibronic levels close to conical intersection (‘the diabatic pair’) are summarized: Pump-probe spectroscopy after selective excitation with ∼100 fs pulses of all-trans carotenoids (Cars) in nonpolar solvent identified a symmetry selection rule in the diabatic electronic mixing and diabatic internal conversion, i.e., ‘1Bu+-to-1Bu− is allowed but 1Bu+-to-3Ag− is forbidden’. On the other hand, pump-probe spectroscopy after coherent excitation with ∼30 fs of all-trans Cars in THF generated stimulated emission with quantum beat, consisting of the long-lived coherent diabatic cross term and a pair of short-lived incoherent terms.

• Publication year

  2010

• Venue

  International Journal of Molecular Sciences

• Publication date

  2010-04-26

• Fields of study

  Medicine, Chemistry

• Identifiers
  DOI 10.3390/ijms11041888PMID 20480049PMCID 2871145
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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