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Exciton dynamics in the chlorosomal antenna of the green bacterium Chloroflexus aurantiacus: experimental and theoretical studies of femtosecond pump-probe spectraстатья
Статья опубликована в высокорейтинговом журнале
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
- Авторы: Yakovlev A.G., Novoderezhkin V.I., Taisova A.S., Fetisova Z.G.
- Журнал: Photosynthesis Research
- Том: 71
- Номер: 1-2
- Год издания: 2002
- Издательство: Springer Nature
- Местоположение издательства: Switzerland
- Первая страница: 19
- Последняя страница: 32
- DOI: 10.1023/A:1014995328869
- Аннотация: Femtosecond absorption difference spectra were measured for chlorosomes isolated from the green bacterium Chloroflexus aurantiacus at room temperature. Using the relative difference absorption of the oligomeric BChl c and monomeric BChl a bands, the size of a unit BChl c aggregate as well as the exciton coherence size were estimated for the chlorosomal BChl c antenna under study. A quantitative fit of the data was obtained within the framework of the exciton model proposed before [Fetisova et al. (1996) Biophys J 71: 995–1010]. The size of the antenna unit was found to be 24 exciton-coupled BChl c molecules. The anomalously high bleaching value of the oligomeric B740 band with respect to the monomeric B795 band provided the direct evidence for a high degree of exciton delocalization in the chlorosomal B740 BChl c antenna. The effective delocalization size of individual exciton wavefunctions (the thermally averaged inverse participation ratio) in the chlorosomal BChl c antenna is 9.5, whereas the steady-state wavepacket corresponds to the coherence size (the inverse participation ratio of the density matrix) of 7.4 at room temperature.
- Добавил в систему: Яковлев Андрей Георгиевич