Observation of Ultrafast Energy Transfer from the Accessory Bacteriochlorophylls to the Special Pair in Photosynthetic Reaction Centers.
AUTHORS
Jia
Y. ,
Jonas
D.M. ,
Joo
T. ,
Nagasawa
Y. ,
Lang
M.J. ,
Fleming
G.R. .
Journal of Physical Chemistry. 1995 4 27; 99(17).
6263-6266
ABSTRACT
The energy transfer from accessory bacteriochlorophyll molecules (B) to the special pair (P) in the reaction centerofRb.capsulatusandRb.sphaeroidesR26hasbeentime-resolvedusing23fspulses. Inbothreaction centers, the B* transient bleaching decays biexponentially, with a fast component of approximately 100 fs which gives a characteristic time scale for excitation energy transfer from B* to P. In Rb. cupsulatus, the amplitudes for this component and a 360 f40fs decay of uncertain origin reported in previous experiments are approximately equal. Several models for the two components are discussed.