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Tönu Pullerits. Portrait.

Tönu Pullerits

Professor

Tönu Pullerits. Portrait.

Exciton states and relaxation in molecular aggregates : Numerical study of photosynthetic light harvesting

Author

  • Tõnu Pullerits

Summary, in English

In this article we briefly review the molecular exciton theory and apply it to photosynthetic light harvesting systems. We derive expressions for exciton relaxation rates using perturbation theory in Hibert space representation and show how the Förster equation can be obtained from a general relaxation rate expression in case of well localized excitons. A detailed analysis of the exciton level structure and wavefunctions of the ring structure is presented for diagonal and nondiagonal disorder. We conclude that the latter plays only a minor role in light-harvesting systems. We emphasize the relaxation rate dependency on square of the energy gap, which makes the high frequency modes particularly important for the exciton relaxation. We found a reasonably good agreement between the measured and calculated relaxation rates in photosynthetic purple bacteria.

Department/s

  • Chemical Physics

Publishing year

2000

Language

English

Pages

773-784

Publication/Series

Journal of the Chinese Chemical Society

Volume

47

Issue

4A

Document type

Journal article

Publisher

Chinese Chemical Society

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • Coherence
  • Excitons
  • LH2
  • Photosynthesis

Status

Published

ISBN/ISSN/Other

  • ISSN: 0009-4536