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Verfasst von:Miki, Takeshi [VerfasserIn]   i
 Buckup, Tiago [VerfasserIn]   i
 Krause, Marie S. [VerfasserIn]   i
 Southall, June [VerfasserIn]   i
 Cogdell, Richard J. [VerfasserIn]   i
 Motzkus, Marcus [VerfasserIn]   i
Titel:Vibronic coupling in the excited-states of carotenoids
Verf.angabe:Takeshi Miki, Tiago Buckup, Marie S. Krause, June Southall, Richard J. Cogdell and Marcus Motzkus
Jahr:2016
Umfang:11 S.
Fussnoten:Gesehen am 15.05.2020
Titel Quelle:Enthalten in: Physical chemistry, chemical physics
Ort Quelle:Cambridge : RSC Publ., 1999
Jahr Quelle:2016
Band/Heft Quelle:18(2016), 16, Seite 11443-11453
ISSN Quelle:1463-9084
Abstract:The ultrafast femtochemistry of carotenoids is governed by the interaction between electronic excited states, which has been explained by the relaxation dynamics within a few hundred femtoseconds from the lowest optically allowed excited state S2 to the optically dark state S1. Extending this picture, some additional dark states (3A−g and 1B−u) and their interaction with the S2 state have also been suggested to play a major role in the ultrafast deactivation of carotenoids and their properties. Here, we investigate the interaction between such dark and bright electronic excited states of open chain carotenoids, particularly its dependence on the number of conjugated double bonds (N). We focus on the ultrafast wave packet motion on the excited potential surface, which is modified by the interaction between bright and dark electronic states. Such a coupling between electronic states leads to a shift of the vibrational frequency during the excited-state evolution. In this regard, pump-degenerate four-wave mixing (pump-DFWM) is applied to a series of carotenoids with different numbers of conjugated double bonds N = 9, 10, 11 and 13 (neurosporene, spheroidene, lycopene and spirilloxanthin, respectively). Moreover, we demonstrate in a closed-chain carotenoid (lutein) that the coupling strength and therefore the vibrational shift can be tailored by changing the energy degeneracy between the 1B+u and 1B−u states via solvent interaction.
DOI:doi:10.1039/C5CP07542D
URL:Bitte beachten Sie: Dies ist ein Bibliographieeintrag. Ein Volltextzugriff für Mitglieder der Universität besteht hier nur, falls für die entsprechende Zeitschrift/den entsprechenden Sammelband ein Abonnement besteht oder es sich um einen OpenAccess-Titel handelt.

Volltext ; Verlag: https://doi.org/10.1039/C5CP07542D
 Volltext: http://xlink.rsc.org/?DOI=C5CP07542D
 DOI: https://doi.org/10.1039/C5CP07542D
Datenträger:Online-Ressource
Sprache:eng
K10plus-PPN:1698350511
Verknüpfungen:→ Zeitschrift

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