The observation of excited-state dynamical evolution in light-harvesting complex LH2 from Rhodobacter sphaeroides 601.
With selective excitation around BChl-B800 and BChl-B850 absorption bands, we observed the evolution of excited-state dynamics in LH2 from Rhodobacter sphaeroides 601. The dynamical traces demonstrate a dominant excited-state absorption (ESA) followed concomitantly by an ultrafast transmission increase and decay with pulse-width limited time scale at 818 nm and 828 nm excitation. The ESA occurring prior to excitonic thermalization or ground-state bleach was observed at 840 nm as well. These experimental results indicate the competition between the transition from excitonic states to higher-lying excited states and interexciton relaxation, which are of physical significance for understanding excitation transfer and related mechanisms in LH2.
Guo
Lijun
L
Physics Department of Fudan University, Shanghai 200433, PR China.
Liu
Yuan
Y
Yang
Yi
Y
Mi
Jun
J
Xu
Can
C
Xu
Chunhe
C
Qian
Shixiong
S
D004735:Energy Transfer; D007700:Kinetics; D007834:Lasers; D008027:Light; D045322:Photosynthetic Reaction Center Complex Proteins / Q000737:chemistry* / Q000528:radiation effects*; D012242:Rhodobacter sphaeroides / Q000737:chemistry*; D019265:Spectroscopy, Near-Infrared; D013816:Thermodynamics
D045322:Photosynthetic Reaction Center Complex Proteins