Fluorescence depolarization dynamics in the B850 complex of purple bacteria

O Kuhn; Villy Sundström; Tönu Pullerits

doi:10.1016/S0301-0104(01)00526-2

Fluorescence depolarization dynamics in the B850 complex of purple bacteria

O Kuhn, Villy Sundström, Tönu Pullerits

Chemical Physics

Research output: Contribution to journal › Article › peer-review

Abstract

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.

Original language	English
Pages (from-to)	15-30
Journal	Chemical Physics
Volume	275
Issue number	1-3
DOIs	https://doi.org/10.1016/S0301-0104(01)00526-2
Publication status	Published - 2002

Bibliographical note

The information about affiliations in this record was updated in December 2015.
The record was previously connected to the following departments: Chemical Physics (S) (011001060)

Subject classification (UKÄ)

Atom and Molecular Physics and Optics

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10.1016/S0301-0104(01)00526-2

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title = "Fluorescence depolarization dynamics in the B850 complex of purple bacteria",

abstract = "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.",

author = "O Kuhn and Villy Sundstr{\"o}m and T{\"o}nu Pullerits",

note = "The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)",

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T1 - Fluorescence depolarization dynamics in the B850 complex of purple bacteria

AU - Kuhn, O

AU - Sundström, Villy

AU - Pullerits, Tönu

N1 - The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Chemical Physics (S) (011001060)

PY - 2002

Y1 - 2002

N2 - 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.

AB - 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.

UR - https://www.scopus.com/pages/publications/0036142391

U2 - 10.1016/S0301-0104(01)00526-2

DO - 10.1016/S0301-0104(01)00526-2

M3 - Article

SN - 0301-0104

VL - 275

SP - 15

EP - 30

JO - Chemical Physics

JF - Chemical Physics

IS - 1-3

ER -

Fluorescence depolarization dynamics in the B850 complex of purple bacteria

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