Ultrafast exciton relaxation in the B850 antenna complex of Rhodobacter sphaeroides.
Ultrafast exciton relaxation in the B850 antenna complex of Rhodobacter sphaeroides.
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球形红杆菌 B850 天线复合体中的超快激子弛豫。
DOI：
10.1073/pnas.93.24.13774
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发表时间：
1996
影响因子：
11.1
通讯作者：
Parson,WW
中科院分区：
文献类型：
--
作者：
Nagarajan,V;Alden,RG;Williams,JC;Parson,WW
在低强度、宽带激发紫色光合细菌球形红细菌的外围天线复合体后，以飞秒分辨率测量光谱变化。还测量了吸收各向异性衰减。我们确定了激发态吸收和发射光谱的 35-fs 弛豫，以及 20-fs 各向异性衰减。我们将这些结果分别解释为圆形细菌叶绿素聚集体广泛离域激子态的层间弛豫和失相。
Spectral changes were measured with femtosecond resolution following low-intensity, broad-band excitation of the peripheral antenna complex of the purple photosynthetic bacteriumRhodobacter sphaeroides. Absorption anisotropy decays also were measured. We identified a 35-fs relaxation of the absorption and emission spectra of the excited state, as well as a 20-fs anisotropy decay. We interpret these results as interlevel relaxation and dephasing, respectively, of extensively delocalized exciton states of the circular bacteriochlorophyll aggregate.