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Ultrafast transient absorption spectroscopy was used to probe excitation energy transfer and trapping at 77K in the photosystem I (PSI) core antenna from the cyanobacterium Synechocystis sp. PCC 6803. Excitation of the bulk antenna at 670 and 680nm induces a subpicosecond energy transfer process that populates the Chl a spectral form at 685–687nm within few transfer steps (300–400 fs). On a picosecond...
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