AI Article Synopsis
- Time-resolved multi-pulse methods were used to study the dynamics, couplings, and energy transfer pathways between light-harvesting pigments in the peridinin-chlorophyll a-protein (PCP) complex.
- The research involved exciting the complex with a short pulse to analyze how energy transitions from peridinin to chlorophylls through various states and how these states influence each other.
- Findings reveal that the S and ICT states of peridinin exist in a distinct equilibrium and that the main pathway for energy transfer is from the intramolecular charge transfer (ICT) state to chlorophyll a (Chl-a).
Article Abstract
Time-resolved multi-pulse methods were applied to investigate the excited state dynamics, the interstate couplings, and the excited state energy transfer pathways between the light-harvesting pigments in peridinin-chlorophyll a-protein (PCP). The utilized pump-dump-probe techniques are based on perturbation of the regular PCP energy transfer pathway. The PCP complexes were initially excited with an ultrashort pulse, resonant to the S→S transition of the carotenoid peridinin. A portion of the peridinin-based emissive intramolecular charge transfer (ICT) state was then depopulated by applying an ultrashort NIR pulse that perturbed the interaction between S and ICT states and the energy flow from the carotenoids to the chlorophylls. The presented data indicate that the peridinin S and ICT states are spectrally distinct and coexist in an excited state equilibrium in the PCP complex. Moreover, numeric analysis of the experimental data asserts ICT→Chl-a as the main energy transfer pathway in the photoexcited PCP systems.
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| http://dx.doi.org/10.1016/j.bbabio.2017.01.014 | DOI Listing |
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