Abstract
The photosynthetic FMO complex is probed by femtosecond pump-probe spectroscopy and compared with a series of genetically modified mutants with distinct excitonic interactions. These experiments allow us to identify vibrational contributions to the coherence.
Highlights
We study the coherent oscillations in FMO complex by exploiting the combination of femtosecond spectroscopy and biological mutagenesis [5]
We report a pump-probe investigation of a series of FMO complexes, where site-mutagenesis enabled us to perturb the energies of selected chromophores, thereby changing their electronic interactions, and compare the generated coherences
Through a systematic comparison of the series of mutated FMO complexes measured under two excitation conditions and at two temperatures, we show that the strongest oscillations detected in our experiment are insensitive to mutagenesis, having similar frequencies and dephasing times in all of the pump-probe data
Summary
We study the coherent oscillations in FMO complex by exploiting the combination of femtosecond spectroscopy and biological mutagenesis [5]. We report a pump-probe investigation of a series of FMO complexes, where site-mutagenesis enabled us to perturb the energies of selected chromophores, thereby changing their electronic interactions, and compare the generated coherences. Through a systematic comparison of the series of mutated FMO complexes measured under two excitation conditions and at two temperatures, we show that the strongest oscillations detected in our experiment are insensitive to mutagenesis, having similar frequencies and dephasing times in all of the pump-probe data.
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