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Low-temperature energy transfer in FMO trimers from the green photosynthetic bacteriumChlorobium tepidum

✍ Scribed by Sergei Savikhin; Walter S. Struve

Book ID: 104619035
Publisher: Springer
Year: 1996
Tongue: English
Weight: 613 KB
Volume: 48
Category: Article
ISSN: 0166-8595
DOI: 10.1007/bf00041018

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✦ Synopsis

The pump-probe kinetics of the slowest spectral equilibrations between inequivalent BChl a Qy states in FMO trimers from Chlorobium tepidum are decelerated by nearly two orders of magnitude when the temperature is lowered from 300 K to 19 K. The pump-probe anisotropy decays are also markedly slower at 19 K than at 300 K. Singlet-singlet annihilation in FMO trimers is negligible at the laser powers used here. However, reduced temperatures greatly accentuate the probability of singlet-triplet annihilation, due to accumulation of metastable BChl a states under high laser repetition rates.

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