Photophysical characterization of the B800-depleted light harvesting complex B850 of Rhodobacter sphaeroides

Leupold, D.; Stiel, H.; Ehlert, J.; Nowak, Frank; Teuchner, Klaus; Voigt, B.; Bandilla, M.; Ücker, Beate; Scheer, Hugo

doi:10.1016/s0009-2614(99)00061-5

Cited by 32 publications

(36 citation statements)

References 30 publications

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“…[2][3][4][5][6][7][8][9][10][11][12][13][14][15] Especially, the efficiency of the excitonic energy transport in these antenna systems has attracted much attention. [16][17][18][19][20][21][22][23][24] Studies on the optical dynamics of excitons in these natural aggregates provide inspiration for the search for artificial antenna systems.…”

Section: Introductionmentioning

confidence: 99%

The Optical Dynamics of Excitons in Cylindrical J-Aggregates

et al. 2002

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The Optical Dynamics of Excitons in Cylindrical J-Aggregates Lampoura, S.S.; Spitz, C.; Dähne, S.; Knoester, Jasper; Duppen, K.; Dahne, S. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. Research and Testing, Richard-Willstaetter-Strasse 11, D-12489 Berlin, Germany. ReceiVed: September 12, 2001; In Final Form: NoVember 28, 2001 The optical dynamics of excitons in cylindrical 5,5′,6,6′-tetrachloro-1,1′-diethyl-3,3′-di(4-sulfobutyl)-benzimidazolocarbocyanine (TDBC)/C8O3 aggregates have been investigated by ultrafast pump-probe spectroscopy and accumulated photon echo experiments. In the nonlinear optical interactions, both the oneexciton band and the two-exciton band are excited. The interpretation of the results involves the separation of the two-exciton states into two types: those that have predominantly "ring"-character, with energy separations determined by the circumference of the cylinder, and those that have predominantly "longitudinal"-character, with energy separations determined by the coherence length of the excitons along the length of the cylinder. At 1.5 K, the excitons were found to be delocalized over an area of, on average, 95 molecules. These excitons can move incoherently to other localized regions on the cylinder, leading to rapid relaxation within the oneexciton band.

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Section: Introductionmentioning

confidence: 99%

The Optical Dynamics of Excitons in Cylindrical J-Aggregates

et al. 2002

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“…We used rate equations with eight-level scheme [18,31] to calculate the population evolution in LH2 under femtosecond pulse excitation. This simplified energy-level scheme is given in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

“…The initial values of the parameters used in the calculation were based on our experimental measurement or taken from other papers [18] . The power density of the laser pulses on the sample was 10 MW/cm 2 .…”

Section: Resultsmentioning

confidence: 99%

“…In a modified LH2 which lacks the B800, the B850 has a small but distinct sideband around 800 nm in the absorption spectrum, which contributes about 20% to the total absorption of the whole B800-850 complex in that wavelength region, and it distinctly exceeds the maximum Q y absorption cross section of monomeric BChl α, reflecting a higher energetic part of the one-exciton transitions in B850. Due to this reason, B850 intra-aggregate relaxation contributes per se to the B800→B850 ET process, and this relaxation is found to be very fast [18] .…”

Section: Introductionmentioning

confidence: 99%

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Excited-state dynamics in light-harvesting complex of Rhodobacter sphaeroides

Liu

Yan

et al. 2008

Sci. Bull.

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“…Secondly, X-ray structures of light harvesting systems have shown that Chls are often so close to each other that Chl-Chl interactions can be expected (Tronrud and Matthews, 1993;Freer et al, 1996;Koepke et al, 1996;Jordan et al, 2001;Cline, 2003;Liu et al, 2004;Standfuss et al, 2005), with the pigments in geometric arrangements that are very similar to those found in Chl aggregates in mixed organic-aqueous media (Scherz et al, 1991). Strong interactions among the Chls have been confi rmed especially in bacterial antennas (Sundström and Grondelle van, 1995;van Rossum et al, 1998;Leupold et al, 1999;Fiedor et al, 2000; Chapter 21, Köhler and Aartsma; Chapter 29, Leupold et al). Assembly problems are frequently observed when amino acids binding the central Mg are modifi ed, and, further, apo-protein complexes fail to assemble in the absence of Chls (Eichacker et al, 1996): this strongly suggests that Chls contribute to the formation and stability of light-harvesting pigment-protein complexes.…”

Section: Structure Stabilizationmentioning

confidence: 99%