Abstract
Absorption-detected ODMR of reaction centers from different strains of Rhodobacter sphaeroides in the temperature range from 4.2 to 75 K are reported. The D and E parameters are independent of temperature. There is no indication of a temperature-dependent charge transfer admixture. Absorption ODMR intensities are interpreted with spin-lattice relaxation and triplet-triplet transfer to the carotinoid of the reaction center. The zfs values of the carotinoid triplet are D = (282 ± 4) × 10 −4 cm −1 and E = (44.5 ± 1) × 10 −4cm −1.
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