The dynamics of the S1 excited states of carotenoids

Harry A. Frank, Roya Farhoosh, Ronald Gebhard, Johan Lugtenburg, David Gosztola, Michael R. Wasielewski

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Abstract

Transient absorption spectroscopy was used to measure the S1 dynamics of four all-trans-carotenoids: 3,4,7,8-tetrahydrospheroidene, 3,4,5,6-tetrahydrospheroidene, 3,4-dihydrospheroidene and spheroidene. After excitation into the S2 state and subsequent relaxation to the S1 state, the S1 → Sn electronic absorption bands in the region 460-520 nm were probed and observed to decay with single-exponential kinetics: τ = 407 ± 23 ps for 3,4,7,8-tetrahydrospheroidene, 85 ± 5 ps for 3,4,5,6-tetrahydrospheroidene, 25.4 ± 0.9 ps for 3,4-dihydrospheroidene and 8.7 ± 0.1 ps for spheroidene. These data are discussed in three contexts: (1) as a test of the adherence of carotenoids to the energy gap law; (2) as a means of determining the S1 state energy of spheroidene, which appears to be at 14100 cm-1; and (3) in terms of the constraints placed on the efficiencies of carotenoid-to-chlorophyll energy transfer in photosynthetic systems.

Original languageEnglish
Pages (from-to)88-92
Number of pages5
JournalChemical Physics Letters
Volume207
Issue number1
DOIs
Publication statusPublished - May 14 1993

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ASJC Scopus subject areas

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

Cite this

Frank, H. A., Farhoosh, R., Gebhard, R., Lugtenburg, J., Gosztola, D., & Wasielewski, M. R. (1993). The dynamics of the S1 excited states of carotenoids. Chemical Physics Letters, 207(1), 88-92. https://doi.org/10.1016/0009-2614(93)85016-H