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The phosphorescence of singlet oxygen ( 1 X ∗ ) photosensitized by the carotenoidless reaction center (RC) of Rhodobacter sphaeroides R26.1 has been investigated, using H 2 O and D 2 O as the suspending media. To enhance (under neutral conditions) the triplet quantum yield of the special pair P 870 (P) by the radical pair mechanism, the quinone acceptor Q ...
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