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Singlet spectra of chromophores in the reaction center of rhodopseudomonas viridis as calculated by the CNDO/S method

✍ Scribed by Bruno Källebring; Sven Larsson

Publisher
Elsevier Science
Year
1987
Tongue
English
Weight
639 KB
Volume
138
Category
Article
ISSN
0009-2614

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✦ Synopsis

The CNDO/S method is used to calculate spectra of monomers and pairs in the reaction center of Rhodopseudomonas uirzdis. The special pair is a strongly coupled dimer and its spectrum cannot be described by exciton coupling theory. The S, and S, states are both suggested to be in the long-wavelength region above 900 nm. The S2 and S, states are CI mixtures of QX-and Q,,-type transitions. The electronic coupling between the special pair and the BPhL monomer is small and therefore it seems reasonable, as suggested by others, that the accessory BChlL monomer is involved either in the formation of the S, state of the special pair or as a very short-lived intermediate in the electron-transfer process.

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