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Proceedings Paper

Determination of the energy transfer rate in photosynthetic systems by means of time-resolved spectroscopy
Author(s): Leonas Valkunas; Gediminas Trinkunas
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Paper Abstract

This report addresses the energy migration problem in the light-harvesting antenna systems of photosynthetic objects. Both linear and nonlinear relaxation cases are discussed. In the linear case, the spectral inhomogeneity is taken into account by averaging the Master equation for the excitation over the spectrally inhomogeneous distribution of pigment molecules. That reformulates the Master equation as the excitation diffusion in the energy space. The stationary solution of this equation enables the determination of the Stokes shift dependence on homogeneous and inhomogeneous spectral bandwidths. The nonlinear relaxation is considered at the singlet-singlet annihilation conditions. The analysis of the fluorescence quantum yield, the excitation delay kinetics as well as the changes of spectral properties of the object under consideration as a function of the excitation intensity, demonstrates the possibility to determine the energy migration parameters. An important conclusion of this analysis is that the real pulse-shape of the excitation as well as the population of higher excited states during the nonlinear annihilation have to be taken into account.

Paper Details

Date Published: 17 June 1993
PDF: 9 pages
Proc. SPIE 1921, Laser Spectroscopy of Biomolecules, (17 June 1993); doi: 10.1117/12.146153
Show Author Affiliations
Leonas Valkunas, Institute of Physics (Lithuania)
Gediminas Trinkunas, Institute of Physics (Lithuania)

Published in SPIE Proceedings Vol. 1921:
Laser Spectroscopy of Biomolecules

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