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Spectroscopy on the B850 Band of Individual Light-Harvesting 2 Complexes of Rhodopseudomonas acidophila. I. Experiments and Monte Carlo Simulations

Title data

Ketelaars, Martijn ; van Oijen, Antoine M. ; Matsushita, Michio ; Köhler, Jürgen ; Schmidt, Jan ; Aartsma, Thijs J.:
Spectroscopy on the B850 Band of Individual Light-Harvesting 2 Complexes of Rhodopseudomonas acidophila. I. Experiments and Monte Carlo Simulations.
In: Biophysical Journal. Vol. 80 (2001) Issue 3 . - pp. 1591-1603.
ISSN 1542-0086
DOI: https://doi.org/10.1016/S0006-3495(01)76132-2

Abstract in another language

The electronic structure of the circular aggregate of eighteen bacteriochlorophyll a (BChl a) molecules responsible for the B850 absorption band of the light-harvesting (LH) 2 complex of the photosynthetic purple bacterium Rhodopseudomonas acidophila has been studied by measuring fluorescence-excitation spectra of individual complexes at 1.2 K. The spectra reveal several well-resolved bands that are obscured in the single, broad B850 band observed in conventional absorption measurements on bulk samples. They are interpreted consistently in terms of the exciton model for the circular aggregate of BChl a molecules. From the energy separation between the different exciton transitions a reliable value of the intermolecular interaction is obtained. The spectra of the individual complexes allow for a distinction between the intra- and the intercomplex disorder. In addition to the random disorder, a regular modulation of the interaction has to be assumed to account for all the features of the observed spectra. This modulation has a C2 symmetry, which strongly suggests a structural deformation of the ring into an ellipse

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: spectroscopy
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik IX - Spektroskopie weicher Materie > Lehrstuhl Experimentalphysik IX - Spektroskopie weicher Materie - Univ.-Prof. Dr. Jürgen Köhler
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik IX - Spektroskopie weicher Materie
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 10 Apr 2018 12:25
Last Modified: 13 Apr 2018 06:11
URI: https://eref.uni-bayreuth.de/id/eprint/43328