An Exciton Dynamics Model of Bryopsis corticulans Light-Harvesting Complex II

Abstract

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Preprocess dependence of optical properties of ensembles and single siphonaxanthin-containing major antenna from the marine green alga Codium fragile

“…In contrast, the rules for energy transfer are rather tolerant resulting in a rich variety for the structures of the light harvesting systems allowing for perfect adaption to the special conditions that apply to the habitat of the organism 2 . In contrast to the LHCs from higher plants the antennae systems from marine algae have only recently attracted more attention [3][4][5][6][7] . Codium fragile is a marine alga that occurs in open coasts and tidal pools, but it can also be found under water in a depth of up to about 20 m. Its LHC is the siphonaxanthinsiphonein-Chl-a/b-protein (SCP) that is optimized for using blue-green light, which is the dominating spectral range under water.…”

Measuring the Ultrafast Spectral Diffusion and Vibronic Coupling Dynamics in CdSe Colloidal Quantum Wells using Two-Dimensional Electronic Spectroscopy

“…Excitonic coupling and energy transfers are the typical processes that can be directly observed in 2DES, as has been applied to several previous studies on various complex systems. ,,− In addition, one phenomenon that can be measured in 2DES but is inaccessible using conventional TA spectroscopy is ultrafast spectral diffusion, which dictates the evolution of the 2D peakshapes due to the ability of 2DES to correlate the excitation and detection frequencies . In ultrafast spectral diffusion, the excited system fluctuates and evolves to different frequencies in the time scale of femtoseconds to picoseconds due to interactions of the system with the environment, including coupling to vibrations of the proteins and/or solvent molecules in the environment as well as lattice phonon modes. − These ultrafast spectral diffusions take place at a much shorter time scale of the spectral diffusion measured by single-molecule PL studies on nanocrystals, which are at time scales of milliseconds to seconds. − One measure of the ultrafast spectral diffusion dynamics of an ensemble is the frequency-fluctuation correlation function (FFCF). ,, FFCF is a useful quantity as it connects microscopic molecular and atomic level dynamics directly to the nonlinear optical spectroscopic measurements such as 2DES.…”

Excitonic energy transfer processes in photosynthetic systems studied with two-dimensional electronic spectroscopy

“…The use of more Chls b helps the algal antenna to adapt to the lighting underwater, where more blue-green light is available. [20][21][22][23] The protein chains of the pigment-protein complexes also affect the transition energies of the embedded pigments, as the molecular conformation can be slightly changed due to the protein binding pocket. This causes further inhomogeneity among the same type of pigments, which can enhance the absorption cross-section, and the collected energy to be gathered to a few pigments with low excited state energies.…”

“…The phenomenological model is shown to replicate the experimental 2DES data well, allowing for a coarse-grained description of the system dynamics and extracting important underlying properties of the system without relying on structural information. 22 Chapter 3 discusses the PSII CC with a focus on explaining the energy correlation between the Chl a Q x and Q y transitions -information that can be exclusively observed in 2D spectra.…”

“…Excitonic coupling and energy transfers are the typical processes that can be directly observed in 2DES, which has been applied in various studies to extract the information from complex systems. 22,38,39,47,54,132,190,195 In addition, one phenomenon that can be measured in 2DES but is not easily accessible using conventional TA spectroscopy is ultrafast spectral diffusion, which dictates the evolution of the 2D peakshapes due to the ability of 2DES to correlate the excitation and detection frequencies. 38 In ultrafast spectral diffusion, the ex-cited system fluctuates and evolves to different frequencies in the time scale of femtoseconds to picoseconds due to interactions of the system with the environment, including coupling to vibrations of the proteins and/or solvent molecules in the environment as well as lattice phonon modes.…”