Two-dimensional electronic spectroscopy reveals ultrafast downhill energy transfer in photosystem i trimers of the cyanobacterium thermosynechococcus elongatus

  • Anna J
  • Ostroumov E
  • Maghlaoui K
 et al. 
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Abstract

Two-dimensional electronic spectroscopy (2DES) was used to investigate the ultrafast energy-transfer dynamics of trimeric photosystem I of the cyanobacterium Thermosynechococcus elongatus. We demonstrate the ability of 2DES to resolve dynamics in a large pigment?protein complex containing ?300 chromophores with both high frequency and time resolution. Monitoring the waiting-time-dependent changes of the line shape of the inhomogeneously broadened Qy(0?0) transition, we directly observe downhill energy equilibration on the 50 fs time scale. Two-dimensional electronic spectroscopy (2DES) was used to investigate the ultrafast energy-transfer dynamics of trimeric photosystem I of the cyanobacterium Thermosynechococcus elongatus. We demonstrate the ability of 2DES to resolve dynamics in a large pigment?protein complex containing ?300 chromophores with both high frequency and time resolution. Monitoring the waiting-time-dependent changes of the line shape of the inhomogeneously broadened Qy(0?0) transition, we directly observe downhill energy equilibration on the 50 fs time scale.

Author-supplied keywords

  • Excited States
  • Photochemistry
  • Spectroscopy

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Authors

  • Jessica AnnaDepartment of Chemistry, University of Pennsylvania

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  • Evgeny E. Ostroumov

  • Karim Maghlaoui

  • James Barber

  • Gregory D. Scholes

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