Chromophore organization in photosynthetic reaction centers: High-resolution magnetophotoselection
- 1 November 1979
- journal article
- research article
- Published by Proceedings of the National Academy of Sciences in Proceedings of the National Academy of Sciences
- Vol. 76 (11) , 5636-5640
- https://doi.org/10.1073/pnas.76.11.5636
Abstract
The electron spin resonance spectrum of the triplet excited state of Rhodopseudomonas sphaeroides R-26 reaction centers was studied after excitation with the polarized narrow-bandwidth output of a tunable dye laser from 520-670 nm. A theory is developed relating experimental observables to the angles between the electronic transition dipole moment of the excited chromophore and the principle magnetic axis system of the triplet state of the dimeric trap. Data is presented which demonstrates that the treatment is correct and useful, and angles are obtained for the Qx transitions of bacteriopheophytin. High-resolution magnetophotoselection data in the region of the bacteriochlorophyll Qx transitions can be combined with polarized photobleaching experiments to provide direct information on the structure of dimeric trap.Keywords
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