Journal
CHEMICAL PHYSICS
Volume 275, Issue 1-3, Pages 15-30Publisher
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DOI: 10.1016/S0301-0104(01)00526-2
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The fluorescence anisotropic decay is modeled for the B850 bacteriochlorophyll a complex of the purple bacterium Rhodopseudomonas acidophila. Structural information is combined with experimental data to derive a Hamilton operator which models the S-0-S-1 excitation energy transfer between the pigments as well as the energy dissipation into the protein environment. The time-resolved fluorescence signal is determined from the solutions of the equations of motion for the one-exciton density matrix. Nonsecular terms in the Redfield relaxation tensor are shown to have a dramatic influence on the calculated time scales for depolarization. (C) 2002 Elsevier Science B.V. All rights reserved.
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