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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
- Source :
- International Journal of Molecular Sciences, Vol 11, Iss 4, Pp 1888-1929 (2010)
- Publication Year :
- 2010
- Publisher :
- MDPI AG, 2010.
-
Abstract
- 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.
Details
- Language :
- English
- ISSN :
- 14220067
- Volume :
- 11
- Issue :
- 4
- Database :
- Directory of Open Access Journals
- Journal :
- International Journal of Molecular Sciences
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.f19a95e680624f21aeac224d1a11fcc4
- Document Type :
- article
- Full Text :
- https://doi.org/10.3390/ijms11041888