Observation of electronic excitation transfer through light harvesting complex II using two-dimensional electronic–vibrational spectroscopy

Nicholas HC Lewis, Natalie L Gruenke, Thomas A A Oliver, Graham R Fleming, Matteo Ballatori, Roberto Bassi

Research output: Contribution to journalArticle (Academic Journal)

30 Citations (Scopus)
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Abstract

Light-harvesting complex II (LHCII) serves a central role in light harvesting for oxygenic photosynthesis and is arguably the most important photosynthetic antenna complex. In this work, we present two-dimensional electronic–vibrational (2DEV) spectra of LHCII isolated from spinach, demonstrating the possibility of using this technique to track the transfer of electronic excitation energy between specific pigments within the complex. We assign the spectral bands via comparison with the 2DEV spectra of the isolated chromophores, chlorophyll a and b, and present evidence that excitation energy between the pigments of the complex are observed in these spectra. Finally, we analyze the essential components of the 2DEV spectra using singular value decomposition, which makes it possible to reveal the relaxation pathways within this complex.
Original languageEnglish
Pages (from-to)4197-4206
Number of pages10
JournalJournal of Physical Chemistry Letters
Volume7
Issue number20
Early online date5 Oct 2016
DOIs
Publication statusPublished - 20 Oct 2016

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