The browser you are using is not supported by this website. All versions of Internet Explorer are no longer supported, either by us or Microsoft (read more here: https://www.microsoft.com/en-us/microsoft-365/windows/end-of-ie-support).

Please use a modern browser to fully experience our website, such as the newest versions of Edge, Chrome, Firefox or Safari etc.

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Exciton coupling induces vibronic hyperchromism in light-harvesting complexes

Author

  • Jan Schulze
  • Magne Torbjörnsson
  • Oliver Kuehn
  • Tönu Pullerits

Summary, in English

The recently suggested possibility that weak vibronic transitions can be excitonically enhanced in light-harvesting complexes is studied in detail. A vibronic exciton dimer model that includes ground-state vibrations is investigated using the multi-configuration time-dependent Hartree method with a parameter set typical to photosynthetic light-harvesting complexes. The absorption spectra are discussed based on the Coulomb coupling, the detuning of the site energies, and the number of vibrational modes. Fluorescence spectra calculations show that the spectral densities obtained from the low-temperature fluorescence line-narrowing measurements of light-harvesting systems need to be corrected for the effects of excitons. For the J-aggregate configuration, as in most light-harvesting complexes, the true spectral density has a larger amplitude than that obtained from the measurement.

Department/s

  • Chemical Physics

Publishing year

2014

Language

English

Publication/Series

New Journal of Physics

Volume

16

Document type

Journal article

Publisher

IOP Publishing

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • coherence
  • electronic 2D spectroscopy
  • excitons
  • vibronic coupling
  • Huang-Rhys factor
  • fluorescence line narrowing

Status

Published

ISBN/ISSN/Other

  • ISSN: 1367-2630