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

Polivka, Tomas LU ; Herek, Jennifer LU ; Zigmantas, Donatas LU ; Åkerlund, Hans-Erik LU and Sundström, Villy LU (1999) In Proceedings of the National Academy of Sciences 96(9). p.4914-4917
Abstract
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.
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
dependence, photophysics, fluorescence, spectroscopy, energy, photosynthesis, spheroidene, dissipation, xanthophyll cycle, internal-conversion rate
in
Proceedings of the National Academy of Sciences
volume
96
issue
9
pages
4914 - 4917
publisher
National Acad Sciences
ISSN
1091-6490
language
English
LU publication?
yes
id
bd2f1e6a-273d-44ed-b1c3-cb9a0b105387 (old id 1432971)
alternative location
http://www.pnas.org/content/96/9/4914.full
date added to LUP
2009-07-01 10:00:33
date last changed
2016-04-16 05:39:47
@article{bd2f1e6a-273d-44ed-b1c3-cb9a0b105387,
  abstract     = {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.},
  author       = {Polivka, Tomas and Herek, Jennifer and Zigmantas, Donatas and Åkerlund, Hans-Erik and Sundström, Villy},
  issn         = {1091-6490},
  keyword      = {dependence,photophysics,fluorescence,spectroscopy,energy,photosynthesis,spheroidene,dissipation,xanthophyll cycle,internal-conversion rate},
  language     = {eng},
  number       = {9},
  pages        = {4914--4917},
  publisher    = {National Acad Sciences},
  series       = {Proceedings of the National Academy of Sciences},
  title        = {Direct observation of the (forbidden) S-1 state in carotenoids},
  volume       = {96},
  year         = {1999},
}