Pathways of energy transfer in LHCII revealed by room-temperature 2D electronic spectroscopy

Kym L. Wells, Petar H. Lambrev, Zhengyang Zhang, Gyözö Garab, Howe Siang Tan

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32 Citations (Scopus)

Abstract

We present here the first room-temperature 2D electronic spectroscopy study of energy transfer in the plant light-harvesting complex II, LHCII. Two-dimensional electronic spectroscopy has been used to study energy transfer dynamics in LHCII trimers from the chlorophyll b Qy band to the chlorophyll a Qy band. Observing cross-peak regions corresponding to couplings between different excitonic states reveals partially resolved fine structure at the exciton level that cannot be isolated by pump-probe or linear spectroscopy measurements alone. Global analysis of the data has been performed to identify the pathways and time constants of energy transfer. The measured waiting time (Tw) dependent 2D spectra are found to be composed of 2D decay-associated spectra with three timescales (0.3 ps, 2.3 ps and >20 ps). Direct and multistep cascading pathways from the high-energy chlorophyll b states to the lowest-energy chlorophyll a states have been resolved occurring on time scales of hundreds of femtoseconds to picoseconds.

Original languageEnglish
Pages (from-to)11640-11646
Number of pages7
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number23
DOIs
Publication statusPublished - Jun 21 2014

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ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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