Femtosecond excited-state dynamics in chlorosomal carotenoids of the photosynthetic bacterium Chloroflexus aurantiacus revealed by near infrared pump–probe spectroscopy

Abstract

In photosynthetic green bacteria, chlorosomes provide light harvesting with high efficiency. Chlorosomal carotenoids (Cars) participate in light harvesting together with the main pigment, bacteriochlorophyll (BChl) c/d/e. In the present work,...

Quenching of bacteriochlorophyll a triplet state by carotenoids in the chlorosome baseplate of green bacterium Chloroflexus aurantiacus

“…In addition, Car participates in energy transfer, absorbing quanta of blue-green light and transferring excitation energy to the main pigments. 8,20,21 And also, Car plays a certain role in stabilizing the structure of the LHC. 19 In most LHCs of various photosynthetic organisms, quenching of triplet states of (B)Chl by Car occurs in the nanosecond and sub-nanosecond range according to the Dexter mechanism: 22 (B)Chl T + Car -(B)Chl + Car T .…”