Energy transfer pathways in light-harvesting complexes of purple bacteria as revealed by global kinetic analysis of two-dimensional transient spectra

Evgeny E. Ostroumov, Rachel M. Mulvaney, Jessica M. Anna, Richard J. Cogdell, Gregory D. Scholes

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

Excited state dynamics in LH2 complexes of two purple bacterial species were studied by broad-band two-dimensional electronic spectroscopy. The optical response was measured in the 500-600 nm spectral region on the 0-400 fs time scale. Global target analysis of two-dimensional (2D) transient spectra revealed the main energy transfer pathways between carotenoid S2, 1B u- and S1 states and bacteriochlorophyll Q x state. Global analysis ascertained the evolutionary and vibration-associated spectra, which also indicated the presence of a higher-lying vibrational level in the carotenoid S1 state. The estimation of the spectral overlap between the 1Bu- state and the Qx state indicated a significant contribution of the 1B u- state to the overall S2-to-Qx excitation energy transfer.

Original languageEnglish (US)
Pages (from-to)11349-11362
Number of pages14
JournalJournal of Physical Chemistry B
Volume117
Issue number38
DOIs
StatePublished - Sep 26 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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