Abstract
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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Abbreviations
- BChl:
-
bacteriochlorophyll
- FMO:
-
Fenna-Matthews-Olson
- fwhm:
-
full width at half maximum
- PB:
-
photobleaching
- SE:
-
stimulated emission
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Savikhin, S., Struve, W.S. Low-temperature energy transfer in FMO trimers from the green photosynthetic bacterium Chlorobium tepidum . Photosynth Res 48, 271–276 (1996). https://doi.org/10.1007/BF00041018
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DOI: https://doi.org/10.1007/BF00041018