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

Authors
Journal
Biochimica et Biophysica Acta (BBA) - Bioenergetics
0005-2728
Publisher
Elsevier
Publication Date
Volume
851
Issue
2
Identifiers
DOI: 10.1016/0005-2728(86)90140-4
Keywords
  • Charge Separation
  • Bacterial Photosynthesis
  • Reaction Center
  • Electron Transfer
  • (Rps. Viridis)
Disciplines
  • Physics

Abstract

Abstract 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.

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