Broadband 2D electronic spectroscopy reveals a carotenoid dark state in purple bacteria

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

Research output: Contribution to journalArticlepeer-review

144 Scopus citations


Although the energy transfer processes in natural light-harvesting systems have been intensively studied for the past 60 years, certain details of the underlying mechanisms remain controversial. We performed broadband two-dimensional (2D) electronic spectroscopy measurements on light-harvesting proteins from purple bacteria and isolated carotenoids in order to characterize in more detail the excited-state manifold of carotenoids, which channel energy to bacteriochlorophyll molecules. The data revealed a well-resolved signal consistent with a previously postulated carotenoid dark state, the presence of which was confirmed by global kinetic analysis. The results point to this state's role in mediating energy flow from carotenoid to bacteriochlorophyll.

Original languageEnglish (US)
Pages (from-to)52-56
Number of pages5
Issue number6128
StatePublished - Apr 5 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General


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