A disordered polaron model for polarized fluorescence excitation spectra of LH1 and LH2 bacteriochlorophyll antenna aggregates

Excitonic polarons in antenna complexes are subject to static lattice disorder. A model has been developed to analyze polarized fluorescence excitation spectra of circular light-harvesting complexes from purple photosynthetic bacteria containing bacteriochlorophyll as the main photoactive pigment th...

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Bibliographic Details
Published inJournal of luminescence Vol. 119; pp. 105 - 110
Main Authors Trinkunas, Gediminas, Freiberg, Arvi
Format Journal Article
LanguageEnglish
Published Elsevier B.V 01.07.2006
Subjects
Diagonal disorder
Excitons
Fluorescence polarization
Off-diagonal disorder
Photosynthetic antenna aggregates
Polarons
Diagonal disorder
Off-diagonal disorder
Fluorescence polarization
Photosynthetic antenna aggregates
Excitons
Polarons
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ISSN0022-2313
1872-7883
DOI10.1016/j.jlumin.2005.12.060

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Summary:Excitonic polarons in antenna complexes are subject to static lattice disorder. A model has been developed to analyze polarized fluorescence excitation spectra of circular light-harvesting complexes from purple photosynthetic bacteria containing bacteriochlorophyll as the main photoactive pigment that includes both diagonal (energetic) and off-diagonal (structural) disorders. Essential differences of disorder realizations seem to exist between the core LH1 and peripheral LH2 complexes from the bacterium Rhodobacter sphaeroides. The disorder in LH1 appears to be dominated by the structural disorder, while that in LH2, by energetic one. These differences may be due to relatively bigger size of the LH1 complex and, consequently, with its enhanced structural flexibility.
ISSN:0022-2313
1872-7883
DOI:10.1016/j.jlumin.2005.12.060