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Direct observation of the (forbidden) S-1 state in carotenoids

Publiceringsår: 1999
Språk: Engelska
Sidor: 4914-4917
Publikation/Tidskrift/Serie: Proceedings of the National Academy of Sciences of the United States of America
Volym: 96
Nummer: 9
Dokumenttyp: Artikel

Sammanfattning

Carotenoids are involved in a variety of biological functions, yet the underlying mechanisms are poorly understood, in part because of the long-standing difficulty in assigning the location of the first excited (S-1) state. Here, we present a method for determining the energy of the forbidden S-1 state, on the basis of ultrafast spectroscopy of the short lived level. Femtosecond transient absorption spectra and kinetics of the S-1 --> S-2 transition revealed the location of the intermediate level in two carotenoid species involved in the xanthophyll cycle, zeaxanthin and violaxanthin, and yielded surprising implications regarding the mechanism of photoregulation in photosynthesis.

Disputation

Nyckelord

  • Chemistry
  • dependence
  • photophysics
  • fluorescence
  • spectroscopy
  • energy
  • photosynthesis
  • spheroidene
  • dissipation
  • xanthophyll cycle
  • internal-conversion rate

Övriga

Published
Yes
  • ISSN: 0027-8424

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