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

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Bibtex

@article{bd2f1e6a273d44edb1c3cb9a0b105387,
title = "Direct observation of the (forbidden) S-1 state in carotenoids",
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.",
keywords = "dependence, photophysics, fluorescence, spectroscopy, energy, photosynthesis, spheroidene, dissipation, xanthophyll cycle, internal-conversion rate",
author = "Tomas Polivka and Jennifer Herek and Donatas Zigmantas and Hans-Erik {\AA}kerlund and Villy Sundstr{\"o}m",
note = "The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Biochemistry and Structural Biology (S) (000006142), Chemical Physics (S) (011001060)",
year = "1999",
language = "English",
volume = "96",
pages = "4914--4917",
journal = "Proceedings of the National Academy of Sciences",
issn = "1091-6490",
publisher = "National Acad Sciences",
number = "9",

}