Excitonic effects in the light-harvesting Chl a/b–protein complex of higher plants
| Autor: | H. Redlin, Th. Schrötter, Th. Renger, J. Pieper, René Schödel, Joachim Voigt |
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| Rok vydání: | 1996 |
| Předmět: |
Coupling
Chlorophyll b Photon Condensed Matter::Other Chemistry business.industry Exciton Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Molecular physics Electronic Optical and Magnetic Materials Condensed Matter::Materials Science chemistry.chemical_compound Optics Semiconductor Molecule Emission spectrum business Biexciton |
| Zdroj: | physica status solidi (b). 194:333-350 |
| ISSN: | 1521-3951 0370-1972 |
| Popis: | Exciton states and their coupling to long-wavelength protein vibrations are investigated both, experimentally and theoretically, in Chl a/b pigment–protein complexes acting as light-harvesting antennae in higher plants. It is shown that the 12 chlorophyll molecules located within the involved protein-monomers form extended exciton states and act cooperatively in the light absorption process. Besides one-exciton excitations also two-exciton excitations are demonstrated at higher photon densities incident on the monomer clusters resulting in nonlinear transmission and emission effects. The distribution of excitons over the exciton energy levels follows a Boltzmann law as shown by emission and nonlinear transmission experiments. The exciton–vibration coupling is weak as indicated by a resonance-like zero-phonon emission line which shows a strong reabsorption. Conclusions are drawn about the structure–function relationship of this antenna type. Interesting similarities between the biological structure investigated and semiconductors or semiconductor structures are discussed. |
| Databáze: | OpenAIRE |
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