Exciton delocalization probed by excitation annihilation in the light-harvesting antenna LH2

被引：113
|
作者：
Trinkunas, G
Herek, JL
Polívka, T
Sundström, V
Pullerits, T
机构：
[1] Univ Lund, Dept Chem Phys, S-22100 Lund, Sweden
[2] Inst Phys, LT-2600 Vilnius, Lithuania
来源：
PHYSICAL REVIEW LETTERS | 2001年 / 86卷 / 18期
关键词：
D O I：
10.1103/PhysRevLett.86.4167
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Singlet-singlet annihilation is used to study exciton delocalization in the light harvesting antenna complex LH2 (B800-B850) from the photosynthetic purple bacterium Rhodobacter sphaeroides. The characteristic femtosecond decay constants of the high intensity isotropic and the low intensity anisotropy kinetics of the B850 ring are related to the hopping time tau (h) and the coherence length N-coh Of the exciton. Our analysis yields Ncoh = 2.8 +/- 0.4 and tau (h) = 0.27 +/- 0.05 ps. This approach can be seen as an extension to the concept of the spectroscopic ruler.
引用
收藏
页码：4167 / 4170
页数：4
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