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

In English

Författare

Summary, in English

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.

Publiceringsår

1999

Språk

Engelska

Sidor

4914-4917

Publikation/Tidskrift/Serie

Proceedings of the National Academy of Sciences

Volym

96

Issue

9

Dokumenttyp

Artikel i tidskrift

Förlag

National Academy of Sciences

Ämne

  • Biological Sciences
  • Atom and Molecular Physics and Optics

Nyckelord

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

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1091-6490