Excitons and excitation transfer in the photosynthetic unit of purple bacteria

Thorsten Ritz; Xiche Hux; Ana Damjanović; Klaus Schulten

doi:10.1016/S0022-2313(97)00286-X

Excitons and excitation transfer in the photosynthetic unit of purple bacteria

Thorsten Ritz, Xiche Hux, Ana Damjanović, Klaus Schulten

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

Abstract

Photosynthetic purple bacteria employ an antenna system to absorb sunlight and transfer electronic excitation to a centrally located protein, the photosynthetic reaction center. The antenna system employs for this purpose a hierarchy of circular bacteriochlorophyll aggregates. For the case of a particular light harvesting protein with known structure, one- and two-exciton spectra of its circular bacteriochlorophyll aggregate are determined by means of an effective Hamiltonian description. A detailed geometric model for the complete antenna system of the purple bacterium Rhodobacter sphaeroides is provided by molecular modelling and its bacteriochlorophyll aggregates are investigated, employing also an effective Hamiltonian. Transfer times within the complete antenna system and from the antennae to the reaction center are calculatec.

Original language	English (US)
Pages (from-to)	310-321
Number of pages	12
Journal	Journal of Luminescence
Volume	76-77
DOIs	https://doi.org/10.1016/S0022-2313(97)00286-X
State	Published - Feb 1998
Externally published	Yes

Keywords

Circular aggregates
Light-harvesting complexes
Photosynthesis

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Atomic and Molecular Physics, and Optics

Online availability

10.1016/S0022-2313(97)00286-X

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title = "Excitons and excitation transfer in the photosynthetic unit of purple bacteria",

abstract = "Photosynthetic purple bacteria employ an antenna system to absorb sunlight and transfer electronic excitation to a centrally located protein, the photosynthetic reaction center. The antenna system employs for this purpose a hierarchy of circular bacteriochlorophyll aggregates. For the case of a particular light harvesting protein with known structure, one- and two-exciton spectra of its circular bacteriochlorophyll aggregate are determined by means of an effective Hamiltonian description. A detailed geometric model for the complete antenna system of the purple bacterium Rhodobacter sphaeroides is provided by molecular modelling and its bacteriochlorophyll aggregates are investigated, employing also an effective Hamiltonian. Transfer times within the complete antenna system and from the antennae to the reaction center are calculatec.",

keywords = "Circular aggregates, Light-harvesting complexes, Photosynthesis",

author = "Thorsten Ritz and Xiche Hux and Ana Damjanovi{\'c} and Klaus Schulten",

note = "Funding Information: The authors acknowledge financial support from the National Institutes of Health [P41RR05969], the National Science Foundation [NSF BIR 9318159a nd NSF BIR-94-23827 (EQ)] as well as from the Carver Charitable Trust.",

year = "1998",

month = feb,

doi = "10.1016/S0022-2313(97)00286-X",

language = "English (US)",

volume = "76-77",

pages = "310--321",

journal = "Journal of Luminescence",

issn = "0022-2313",

publisher = "Elsevier B.V.",

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TY - JOUR

T1 - Excitons and excitation transfer in the photosynthetic unit of purple bacteria

AU - Ritz, Thorsten

AU - Hux, Xiche

AU - Damjanović, Ana

AU - Schulten, Klaus

N1 - Funding Information: The authors acknowledge financial support from the National Institutes of Health [P41RR05969], the National Science Foundation [NSF BIR 9318159a nd NSF BIR-94-23827 (EQ)] as well as from the Carver Charitable Trust.

PY - 1998/2

Y1 - 1998/2

N2 - Photosynthetic purple bacteria employ an antenna system to absorb sunlight and transfer electronic excitation to a centrally located protein, the photosynthetic reaction center. The antenna system employs for this purpose a hierarchy of circular bacteriochlorophyll aggregates. For the case of a particular light harvesting protein with known structure, one- and two-exciton spectra of its circular bacteriochlorophyll aggregate are determined by means of an effective Hamiltonian description. A detailed geometric model for the complete antenna system of the purple bacterium Rhodobacter sphaeroides is provided by molecular modelling and its bacteriochlorophyll aggregates are investigated, employing also an effective Hamiltonian. Transfer times within the complete antenna system and from the antennae to the reaction center are calculatec.

AB - Photosynthetic purple bacteria employ an antenna system to absorb sunlight and transfer electronic excitation to a centrally located protein, the photosynthetic reaction center. The antenna system employs for this purpose a hierarchy of circular bacteriochlorophyll aggregates. For the case of a particular light harvesting protein with known structure, one- and two-exciton spectra of its circular bacteriochlorophyll aggregate are determined by means of an effective Hamiltonian description. A detailed geometric model for the complete antenna system of the purple bacterium Rhodobacter sphaeroides is provided by molecular modelling and its bacteriochlorophyll aggregates are investigated, employing also an effective Hamiltonian. Transfer times within the complete antenna system and from the antennae to the reaction center are calculatec.

KW - Circular aggregates

KW - Light-harvesting complexes

KW - Photosynthesis

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SN - 0022-2313

VL - 76-77

SP - 310

EP - 321

JO - Journal of Luminescence

JF - Journal of Luminescence

ER -

Excitons and excitation transfer in the photosynthetic unit of purple bacteria

Abstract

Keywords

ASJC Scopus subject areas

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