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Tönu Pullerits. Portrait.

Tönu Pullerits

Professor

Tönu Pullerits. Portrait.

Ultrafast carotenoid band shifts: Experiment and theory

Author

  • Jennifer Herek
  • M Wendling
  • Zhi He
  • Tomas Polivka
  • G Garcia-Asua
  • R J Cogdell
  • C N Hunter
  • R van Grondelle
  • Villy Sundström
  • Tönu Pullerits

Summary, in English

The ultrafast carotenoid band shift upon excitation of nearby bacteriochlorophyll molecules was studied in three different light harvesting complexes from purple bacteria. The results were analyzed in terms of changes in local electric field of the carotenoids. Time dependent density functional theory calculations based on known and model structures led to good agreement with experimental results, strongly suggesting that the mutual orientation of the pigment molecules rather than the type of the carotenoid molecules determines the extent of the ultrafast band shift. We further estimate that the protein induced local field nearby carotenoid molecule is about 4 or 6 MV/cm, depending on the orientation of the change of the electrical dipole in the carotenoid upon optical transition.

Department/s

  • Chemical Physics

Publishing year

2004

Language

English

Pages

10398-10403

Publication/Series

The Journal of Physical Chemistry Part B

Volume

108

Issue

29

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Atom and Molecular Physics and Optics

Status

Published

ISBN/ISSN/Other

  • ISSN: 1520-5207