Circular dichroism of carotenoids in bacterial light-harvesting complexes: experiments and modeling.

ABSTRACT: In this work we investigate the origin and characteristics of the circular dichroism (CD) spectrum of rhodopin glucoside and lycopene in the light-harvesting 2 complex of Rhodopseudomonas acidophila and Rhodospirillum molischianum, respectively. We successfully model their absorption and CD spectra based on the high-resolution structures. We assume that these spectra originate from seven interacting transition dipole moments: the first corresponds to the 0-0 transition of the carotenoid, whereas the remaining six represent higher vibronic components of the S2 state. From the absorption spectra we get an estimate of the Franck-Condon factors of these transitions. Furthermore, we investigate the broadening mechanisms that lead to the final shape of the spectra and get an insight into the int

SUBMITTER: Georgakopoulou S 

PROVIDER: S-EPMC1304774 | biostudies-literature | 2004 Nov

REPOSITORIES: biostudies-literature