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• W3100448693 abstract "Förster theory describes electronic exciton energy migration in molecular assemblies as an incoherent hopping process between donor and acceptor molecules. The rate is expressed in terms of the overlap integral between donor fluorescence and acceptor absorption spectra. Typical time scales for systems like photosynthetic antennae are on the order of a few picoseconds. Prior to transfer, it is assumed that the initially excited donor molecule has equilibrated with respect to the local environment. However, upon excitation and during the equilibration phase, the state of the system needs to be described by the full density matrix, including coherences between donor and acceptor states. While being intuitively clear, addressing this regime experimentally has been a challenge until the recently reported advances in fluorescence detected two-dimensional spectroscopy. Here, we demonstrate using fourth order perturbation theory the conditions for the presence of donor-acceptor coherence induced cross-peaks at zero waiting time between the first and the second pair of pulses. The approach is illustrated for a heterodimer model which facilitates an analytical solution." @default.
• W3100448693 created "2020-11-23" @default.
• W3100448693 creator A5000737379 @default.
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• W3100448693 date "2018-09-20" @default.
• W3100448693 modified "2023-10-18" @default.
• W3100448693 title "Using fluorescence detected two-dimensional spectroscopy to investigate initial exciton delocalization between coupled chromophores" @default.
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• W3100448693 doi "https://doi.org/10.1063/1.5046645" @default.
• W3100448693 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30243281" @default.
• W3100448693 hasPublicationYear "2018" @default.
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