Electronic and Vibrational Coherences in Algal Light-Harvesting Proteins
Department of Chemistry and Centre for Quantum Information and Quantum Control, University of Toronto, Toronto ON M5S 3H6, Canada
We present broadband two-dimensional electronic spectra of a lightharvesting protein from photosynthetic algae. Analysis of the spectra show that the amplitude of the main cross peak oscillates as a function of the waiting time period. Both electronic coupling and intramolecular vibrational modes, and their mixture, can lead to such oscillations. Using predictions based on models of four-level systems, we describe ways to distinguish electronic from vibrational contributions to the coherence and find that both types of coupling contribute to the measured dynamics.
© Owned by the authors, published by EDP Sciences, 2013
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