Femtosecond energy-transfer dynamics between bacteriochlorophylls in the B800-820 antenna complex of the photosynthetic purple bacterium Rhodopseudomonas acidophila (Strain 7750)

Article Abstract:

Results of direct femtosecond time-resolved measurements on the B800-820 complex derived from Rhodopseudomonas acidophila provide new information regarding the ultrafast intraband and interband energy-transfer and relaxation processes. The study, which employed the femtosecond one-color pump-probe technique, used different excitation and detection wavelengths and two temperature levels. Findings revealed that the isotropic and anisotropic decays within the B800 band are influenced by wavelength and temperature. The blue-shifted B820 band was found to have no impact on the interband transfer rate.

Chlorophyll

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Theory on rates of excitation-energy transfer between molecular aggregates through distributed transition dipoles with application to the antenna system in bacterial photosynthesis

Article Abstract:

Research was conducted to develop a formula for calculating the rate constant of excitation-energy transfer (EET) that accounts for the experimental observations and merges into Forster's formula when the donor-acceptor distance is much bigger than the size of the aggregate. The new formula was correct in describing that EET occurs in the reaction center from an accessory BChl to the upper weakly allowed exciton state. The new formula also describes the EET as occurring with energies at approximately 12,500/cm of B800.

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Energy relaxation within the B850 absorption band of the isolated light-harvesting complex LH2 from Rhodopseudomonas Acidophila at low temperature

Article Abstract:

Research was conducted to examine the excitation dynamics of isolated LH2 complexes from Rhodopseudomonas acidophila at a low temperature of 7 K using two-color femtosecond absorption spectroscopy. Two kinetic components were observed in the subpicosecond time region and in the position of the position of the isosbestic wavelength of the absorbance difference spectrum. Results indicate that energy relaxation in the B850 aggregate of the LH2 complex is very fast at low temperature which agrees with previous results.

Absorption, Nuclear excitation, Relaxation (Nuclear physics)

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