Exciton relaxation and polaron formation in LH2 at low temperature

Article Abstract:

The nature of the electronic excited states and their dynamics and coupling to the nuclear degrees of freedom in antennae of photosynthetic purple bacteria are considered. It was found that, in addition to the fast exciton relaxation, a set of slower processes occurs in B850 at low temperatures.

Exciton theory, Polarons, Excitons

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Near-infrared time-resolved study of the S(sub 1) state dynamics of the carotenoid spheroidene

Article Abstract:

A new experimental approach based on near-infrared femtosecond absorption spectroscopy the energy of the S1 state of the carotenoid spheroidene is presented. Measurements of kinetics in the near-infrared region revealed that at least three relaxation processes take place after excitation of spheroidene into its S2 state.

Near infrared spectroscopy, Optical properties, Sulfur, Sulphur

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Ultrafast formation of a carotenoid radical in LH2 antenna complexes of purple bacteria

Article Abstract:

Femtosecond time-resolved transient absorption spectroscopy is used to examine the Si-mediated carotenoid to BChl an energy-transfer pathway and carotenoid radical formation. A series of LH2 complexes from Rhodobacter sphaeroides incorporating carotenoids neurosporene, pheroidene, and spheroidenone are used to explore the effect of conjugation length.

Analysis, Energy transfer

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