Abstract
The absorption and emission spectra of excitons in LH1 and LH2 antenna complexes from the photosynthetic purple bacterium Rhodobacter sphaeroides have been studied under hydrostatic pressure varying between ambient pressure and 6 kbar. The observations performed at low (80 K) and physiological temperatures reveal distinctive differences in spectral response of LH1 and LH2 excitons to compression. Analysis shows that unlike in LH2 where small-radius self-trapped excitons exist, the self-trapping is much less developed in LH1. This is probably because the resonant exciton coupling in the LH1 complex is relatively stronger at similar exciton-lattice coupling energy.
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