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Portrait of Tönu Pullerits; Photo: Kennet Ruona

Tönu Pullerits

Professor

Portrait of Tönu Pullerits; Photo: Kennet Ruona

Bacteriochlorophyll in Electric Field.

Author

  • Pär Kjellberg
  • Zhi He
  • Tönu Pullerits

Summary, in English

The spectroscopic properties of a molecule is strongly dependent on interactions with the surrounding environment. We have used time dependent density functional theory (TDDFT) and a multilevel perturbation model to study the transition energies, polarizability, and dipole moments of a bacteriochlorophyll in an electric field. The perturbation Hamiltonian was constructed as to give an electric field dependence of the transition energies in agreement with the result from TDDFT. It was found that, to reach agreement, it was not enough to use the Q and Soret bands of the bacteriochlorophyll; additional energy levels had to be introduced. The change in dipole moment and polarizability for the two lowest excited states Qx and Qy were calculated. Our calculations predict a negative change in polarizability for the ground state to Qy transition.

Department/s

  • Chemical Physics

Publishing year

2003

Language

English

Pages

13737-13742

Publication/Series

The Journal of Physical Chemistry Part B

Volume

107

Issue

49

Document type

Journal article

Publisher

The American Chemical Society (ACS)

Topic

  • Atom and Molecular Physics and Optics

Status

Published

Research group

  • Pullerits

ISBN/ISSN/Other

  • ISSN: 1520-5207