MODELS FOR ANTENNA AND PHOTOREACTION CENTER CHLOROPHYLL a IN GREEN PLANT PHOTOSYNTHESIS, EXCITON TRANSITIONS IN CHLOROPHYLL a ARRAYS

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1977

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Ohio State University

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Abstract

Exciton transitions have been computed for sixteen distinct cases of two- and three-dimensional arrays of chlorophyll a molecules. The arrays are distinguished by varying packing densities and by constraints applied to the orientation of each of the transition dipoles. Each array consists of 40 antenna chlorophyll a molecules and one P700 chromophore associated with the reaction center of photosystem I. Transition density interactions between antenna chlorophyll a and P700 ``pushes” the P700 band to lower energy while increasing or decreasing the dipole strength of the P700 band by as much as 50%. The various arrays are discussed in terms of their suitability as models for the arrangement of chlorophyll a in vivo.

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This work was performed under the auspices of the Division of Physical Research, ERDA.
Author Institution: Chemistry Division, Argonne National Laboratory

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