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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Temperature dependent exciton-exciton annihilation in the LH2 antenna complex

Author

  • Ben Brueggemann
  • Niklas Christensson
  • Tönu Pullerits

Summary, in English

Two-color pump-probe measurements of the peripheral light harvesting complex LH2 of Rb.sphaeroides reveal strong temperature dependence of the annihilation rate. The experimental results were modeled via multi-exciton density matrix theory. Based on available literature data we can set an upper limit for the feasible intramolecular internal conversion rate. We show that this also restricts the possible values of the still ill-determined energy of the doubly-excited molecular level of the bacteriochlorophyll, which is responsible for the annihilation process. (C) 2008 Elsevier B.V. All rights reserved.

Department/s

  • Chemical Physics

Publishing year

2009

Language

English

Pages

140-143

Publication/Series

Chemical Physics

Volume

357

Issue

1-3

Document type

Journal article

Publisher

Elsevier

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • Internal conversion
  • Pump-probe spectroscopy
  • LH2
  • Exciton-exciton annihilation
  • Photosynthetic antenna system

Status

Published

ISBN/ISSN/Other

  • ISSN: 0301-0104