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

Jessica M. Anna, Evgeny E. Ostroumov, Karim Maghlaoui, James Barber, Gregory D. Scholes

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

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.

Original languageEnglish (US)
Pages (from-to)3677-3684
Number of pages8
JournalJournal of Physical Chemistry Letters
Volume3
Issue number24
DOIs
StatePublished - Dec 20 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physical and Theoretical Chemistry

Keywords

  • Excited States
  • Photochemistry
  • Spectroscopy

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