Picosecond absorbance difference spectra of the antenna of photosynthetic purple bacteria The influence of exciton interactions and librations

FEBS Letters

Novoderezhkin, Vladimir²  Danielius, Romualdas¹  Razjivin, Andrei³ 

[1] Physical Faculty, Vilnius University, Vilnius, Lithuania;Scientific Research Center on Technological Lasers, Russian Academy of Science, Troizk, Moscow Region, Russian Federation;International Laser Center, Moscow State University, Moscow, Russian Federation

关键词: Exciton interaction;    Pseudolocal librational mode;    Bacterial photosynthesis;    Light-harvesting antenna;    BChl;    bacteriochlorophyll;    R rubrum;    Rhodospirillum rubrum.;   

DOI  :  10.1016/0014-5793(94)00428-5

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The influence of exciton interactions and pseudolocal librational modes on the relaxation of photo-induced absorption changes of the light-harvesting antenna of the photosynthetic purple bacterium, Rhodospirillum rubrum, was studied in the ps time domain. A hypothesis is put forward that the long-lived librational modes can occur in the circular aggregate of light-harvesting bacteriochlorophyll molecules of the core antenna. The model spectra obtained quantitatively fit the shape of the photo-induced picosecond absorbance difference spectra. The model predicts the decay of photo-induced spectra with the time constant within tens of picoseconds.

【 授权许可】

Unknown