Calculation of couplings and energy-transfer pathways between the pigments of LH2 by the ab initio transition density cube method

Article Abstract:

A general approach for measuring the Coulombic coupling between closely interacting or weakly allowed transition densities of donor and acceptor is presented. The method is applied to examine the Coulombic coupling within bacterial light-harvesting antenna. The calculations indicate that energy flow both from the carotenoid and the B800 bacteriochlorophyll a into pigments of several different protomer units suggesting that interaction between protomer units have a significant role in the light-harvesting antenna function.

Organic pigments, Electron donor-acceptor complexes

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Electronic excitation transfer from carotenoid to bacteriochlorophyll in the purple bacterium Rhodopseudomonas acidophila

Article Abstract:

The electronic excitation transfer capability of the light-harvesting antenna of the bacterium Rhodopseudomonas acidophila was examined using ultrafast fluorescence upconversion. The caretonoids harvest light and quickly transfer energy to the bacteriochlorophyll (Bchl). Calculations of the efficiency transfer from the carotenoid to the Bchl suggests a 70% electronic efficiency transfer with the 30% remaining with the carotenoid ground state.

Carotenoids, Quantum chemistry, Excited state chemistry

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Two-photon excitation spectrum of light-harvesting complex II and fluorescence upconversion after one- and two-photon excitation of the carotenoids

Article Abstract:

It has been possible to measure the two-photon excitation spectrum of light-harvesting complex II in the spectral region of 1000 nm to 1600 nm. The lowest excited states of the carotenoids have a 0-0 transition around 15 100 plus or minus 300 cm-1.

Photons, Electromagnetic scattering, Carotenoid metabolism, Nuclear excitation

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• Abstracts: Characterization of low-energy chlorophylls in the PSI-LHCI supercomplex from Chlamydomonas reinhardtii. A site-selective fluorescence study

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