Nonlinear annihilation of excitations in photosynthetic systems

The theory of the singlet-singlet annihilation in quasi-homogeneous photosynthetic antenna systems is developed further. In the new model, the following important contributions are taken into account: 1) the finite excitation pulse duration, 2) the occupation of higher excited states during the anni...

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Bibliographic Details
Published in:Biophysical journal 1995-09, Vol.69 (3), p.1117-1129
Main Authors: Valkunas, L., Trinkunas, G., Liuolia, V., van Grondelle, R.
Format: Article
Language:English
Subjects:
Kinetics
Mathematics
Models, Theoretical
Photosynthesis
Photosynthetic Reaction Center Complex Proteins - chemistry
Photosynthetic Reaction Center Complex Proteins - metabolism
Rhodospirillum rubrum - metabolism
Spectrometry, Fluorescence
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Summary:The theory of the singlet-singlet annihilation in quasi-homogeneous photosynthetic antenna systems is developed further. In the new model, the following important contributions are taken into account: 1) the finite excitation pulse duration, 2) the occupation of higher excited states during the annihilation, 3) excitation correlation effects, and 4) the effect of local heating. The main emphasis is concentrated on the analysis of pump-probe kinetic measurements demonstrating the first two above possible contributions. The difference with the results obtained from low-intensity fluorescence kinetic measurements is highlighted. The experimental data with picosecond time resolution obtained for the photosynthetic bacterium Rhodospirillum rubrum at room temperature are discussed on the basis of this theory.
ISSN:0006-3495
1542-0086
DOI:10.1016/S0006-3495(95)79986-6