Abstract

Pulse laser fluorometry is successfully applied both to study primary photosynthesis processes and for environmental control including laser remote sensing.^1-3 These techniques are based on the detection of in-vivo chlorophyll-a (Chl-a) fluorescence. It forms as a byproduct of primary photosynthetic processes induced by laser-pulse excitation. A serious problem is adequate description of energy migration accompanying these complex processes. We have proposed and developed a multicentral heterogeneous model, which takes into account the exciton migration among neighboring photosynthetic units, the singlet-singlet exciton annihilation, the pigment enlightment, and changes of the reaction center (RC) functional state under laser excitation. For test comparison with the experimental data, the saturation of "constant" and "variable" components of Chl-a fluorescence has been calculated using the proposed model.

© 1992 Optical Society of America