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Excitation delocalization in the bacteriochlorophyll c antenna of the green bacterium Chloroflexus aurantiacus as revealed by ultrafast pump‐probe spectroscopy

pmid: 9688564
Room temperature absorption difference spectra were measured on the femtosecond through picosecond time scales for chlorosomes isolated from the green bacterium Chloroflexus aurantiacus. Anomalously high values of photoinduced absorption changes were revealed in the BChl c Qy transition band. Photoinduced absorption changes at the bleaching peak in the BChl c band were found to be 7–8 times greater than those at the bleaching peak in the BChl a band of the chlorosome. This appears to be the first direct experimental proof of excitation delocalization over many BChl c antenna molecules in the chlorosome.
- Iowa State University United States
- Arizona State University United States
- Ames Laboratory United States
- Ames Laboratory United States
- Iowa State University United States
Organelles, Bacterial photosynthesis, Lasers, Spectrum Analysis, Bacteriochlorophyll c, Chlorobi, Absorption difference spectroscopy, Bacterial Proteins, Energy Transfer, Green photosynthetic bacteria, Bacteriochlorophylls, Antenna pigment organization, Ultrafast spectroscopy
Organelles, Bacterial photosynthesis, Lasers, Spectrum Analysis, Bacteriochlorophyll c, Chlorobi, Absorption difference spectroscopy, Bacterial Proteins, Energy Transfer, Green photosynthetic bacteria, Bacteriochlorophylls, Antenna pigment organization, Ultrafast spectroscopy
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