Electric field effects on reaction centers from Rb. sphaeroides have been detected in ps-transient absorption at 90 K. Upon application of a field of 7 X 10s V/cm the bleaching of the bacteriopheophytin at the A branch (H,, 545 nm) monitored after 30 ps mirrors a reduction of the quantum yield of P+
Electric field modulation of charge transfer processes in reaction centers of photosynthetic bacteria
β Scribed by Z.D. Popovic; G.J. Kovacs; P.S. Vincett; P.L. Dutton
- Publisher
- Elsevier Science
- Year
- 1985
- Tongue
- English
- Weight
- 644 KB
- Volume
- 116
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
External electric field modulation of charge separation 2nd recombinatton processes has been achieved in native photosynthetic reaction centers. Langmuir-Blodgett monolayer films of reaction centers isolated from the photosynthetic bacterium Rhodopseudomonas sphaero~des, have been incorporated into electroded sandwich cell structures allowing field modulation of both photoinduced bleaching and time-resolved absorption recovery.
π SIMILAR VOLUMES
The fluorescence intensity from randomly oriented Rhodobacter (Rb.) sphaeroides photosynthetic reaction centers at 77 K increases in an applied electric field. This is ascribed to a net reduction in the rate of the initial electron transfer reaction which competes with fluorescence due to the effect
Kinetic and singlet-triplet data are used to treat the mechanism of electron transfer for BChll-BChl-BPh in bacterial photosynthetic reaction centers. The data favor a two-step transfer rather than a superexchange single step.
Time-resolved spectroscopy in conjunction with magnetic-field-dependent recombination dynamics of the primary radical ion pair in reaction centers of Rb. sphaeroides R26, were used to analyze the mechanism of electron transfer from the bacteriochlorophyll dimer in its excited singlet state ( 'P\*) t