Picosecond charge separation upon selective excitation of the primary electron donor in reaction centers of Rhodopseudomonas viridis

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Measurement of picosecond absorbance changes in the near-infrared and visible region in reaction centers of Rhodopseudomonas viridis upon selective excitation of the primary electron donor P-960 showed that the time constant for electron transfer to bacteriopheophytin b in the presence of reduced quinone acceptor is 12 ± 2 ps. At earlier times simultaneous bleachings at 970 and 850 nm were observed. The corresponding difference spectrum does not appear to be due to excited P-960 and is attributed to electron transfer from P-960 to bacteriochlorophyll serving as an intermediate electron acceptor.