title: Investigation of the S1/ICT equilibrium in fucoxanthin by ultrafast pump-dump-probe and femtosecond stimulated Raman scattering spectroscopy.
abstract: Time-resolved multi-pulse spectroscopic methods-pump-dump-probe (PDP) and femtosecond stimulated Raman spectroscopy-were used to investigate the excited state photodynamics of the carbonyl group containing carotenoid fucoxanthin (FX). PDP experiments show that S1 and ICT states in FX are strongly coupled and that the interstate equilibrium is rapidly (<5 ps) reestablished after one of the interacting states is deliberately depopulated. Femtosecond stimulated Raman scattering experiments indicate that S1 and ICT are vibrationally distinct species. Identification of the FSRS modes on the S1 and ICT potential energy surfaces allows us to predict a possible coupling channel for the state interaction.
authors.affiliation: Department of Quantum Electronics, Faculty of Physics, Vilnius University, Saulėtekio AV. 10, 10223, Vilnius, Lithuania. kipras.redeckas@ff.vu.lt.
authors.forename: Kipras
authors.initials: K
authors.lastname: Redeckas
authors.affiliation: Department of Quantum Electronics, Faculty of Physics, Vilnius University, Saulėtekio AV. 10, 10223, Vilnius, Lithuania.
authors.forename: Vladislava
authors.initials: V
authors.lastname: Voiciuk
authors.affiliation: Department of Quantum Electronics, Faculty of Physics, Vilnius University, Saulėtekio AV. 10, 10223, Vilnius, Lithuania.
authors.forename: Mikas
authors.initials: M
authors.lastname: Vengris
mesh_terms: D002338:Carotenoids / Q000032:analysis*; D004735:Energy Transfer; D008027:Light; D056004:Molecular Dynamics Simulation; D013057:Spectrum Analysis / Q000379:methods*; D013059:Spectrum Analysis, Raman / Q000379:methods; D013997:Time Factors; D024341:Xanthophylls / Q000032:analysis*
chemical_list: D024341:Xanthophylls; C025164:fucoxanthin; D002338:Carotenoids
keywords: FSRS; Femtosecond stimulated Raman spectroscopy; Fucoxanthin; Internal charge transfer; PDP; Pump–dump–probe