Transfer of excitation energy in a three‐dimensional‐doped molecular crystal. V. Self‐consistency of the temporal processes involved in energy transfer in photosynthetic units

摘要: Numerical experiments were carried out to determine the timewise self-consistency of different physical processes involved in energy transfer green plant photosynthetic units. A 6 × array chlorophyll-a with cubic lattice constants a = b c 20 was chosen as model thylakoid disc. Another aggregate obtained by substituting chlorophyll-b molecules for some molecules. In both models, reaction center occupied central site last xy plane. Two extreme arrangements considered orientation one, transition moments all directed along y-axis. The other had chlorophyll randomly oriented. four resulting systems used our investigation on exciton generation, transport, decay fluorescence, and trapping. All excitons assumed be generated ms exposure sunlight at high altitudes. general trends noticed from these computations are follows: number is influenced disorders. Disorders also increase time establishment an equilibrium distribution. fluorescence always monotonic function time. adversely affected lower degree crystal: trapping increases disorder. trappings decreases onset host trap. From investigations, we made three specific observations: (1) efficiency utilization varies 12% completely random arrangement dipoles 46% perfectly ordered arrangement. This agrees experimental efficiency, about 20%. (2) trapped one six. tallies scale electron Z-scheme that requires least two ms. Thus, photon density rate consistent rates transfers. (3) indicates disc must resemble considerably system. © 1996 John Wiley & Sons, Inc.