The Ultrafast Energy Transfer Process in Purple Bacteria Photosynthetic Reaction Center.
The ultrafast energy transfer process, which takes place in femtosecond time range, in bacterial photosynthetic reaction center RS601 was investigated using femtosecond pump-probe technique with selective excitation. Upon 755 nmexcitation, the excited state of bacteriopheophytin H decayed to bacteriochlorophyll B with a time constant of about 130 fs, while the excited state of B transported the energy to its energy acceptor, the dimeric bacteriochlorophyll P, in about 240 fs with the 800 nm excitation. The internal conversion process between the upper and lower exciton levels of special pair P might exist upon the excitation of 850 nm pulses. In addition, from the results obtained in our experiments, the charge separation and electron transfer from P to the acceptor H was also observed via the real intermediate B within a few picoseconds.
Guo
Li-Jun
LJ
Physics Department of Fudan University, Shanghai 200433, China 2National Key Laboratory of Applied Surface Physics, Fudan University, Shanghai 200433, China. 990260@fudan.edu.cn
Ma
Guo-Hong
GH
Zou
Yong-Long
YL
Yang
Yi
Y
Liu
Yuan
Y
Xu
Chun-He
CH
Qian
Shi-Xiong
SX