Abstract
An energy transfer pathway in a carotenoid-chlorophyll a protein complex of dinoflagellates was studied by the femtosecond up-conversion method. The energy levels of the S 2 state of peridinin and their lifetime were essentially identical in methanol and in the complex. The S 1 lifetime of peridinin in solvents was more than 30-fold longer than in the complex. These results account for an observed transfer efficiency (higher than 85%) and indicate that an energy transfer occurs between the S 1 states of peridinin and chlorophyll a after a rapid internal conversion. This pathway is unique in photosynthetic organisms.
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