Direct visualization of exciton reequilibration in the LH1 and LH2 complexes of Rhodobacter sphaeroides by multipulse spectroscopy.
Direct visualization of exciton reequilibration in the LH1 and LH2 complexes of Rhodobacter sphaeroides by multipulse spectroscopy.
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通过多脉冲光谱直接可视化球形红杆菌 LH1 和 LH2 复合物中的激子再平衡。
DOI：
10.1016/j.bpj.2011.02.048
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发表时间：
2011
影响因子：
3.4
通讯作者：
Rienk van Grondelle
中科院分区：
文献类型：
--
作者：
Thomas A. Cohen Stuart;M. Vengris;V. Novoderezhkin;R. Cogdell;C. Hunter;Rienk van Grondelle
球形红杆菌的光捕获配合物LH1和LH2的激发态动力学主要由这些环系统的激子性质决定。在泵-转储-探针实验中，第一脉冲促进LH1或LH2达到激发态，第二脉冲转储激发态的一部分。通过选择性倾倒，我们可以解开通常隐藏在激发态流形中的动力学。我们发现，通过使用这种多重激发技术，我们可以看到一个400-fs的再平衡，反映了两个最低激子态之间的松弛，这是传统的泵浦探针无法直接探测到的。在激子再平衡中观察到振荡特征，这归因于周期为~ 150fs的振动波包的相干运动。我们的无序激子模型允许对这些天线中观察到的再平衡过程进行定量解释。
The dynamics of the excited states of the light-harvesting complexes LH1 and LH2 ofRhodobacter sphaeroidesare governed, mainly, by the excitonic nature of these ring-systems. In a pump-dump-probe experiment, the first pulse promotes LH1 or LH2 to its excited state and the second pulse dumps a portion of the excited state. By selective dumping, we can disentangle the dynamics normally hidden in the excited-state manifold. We find that by using this multiple-excitation technique we can visualize a 400-fs reequilibration reflecting relaxation between the two lowest exciton states that cannot be directly explored by conventional pump-probe. An oscillatory feature is observed within the exciton reequilibration, which is attributed to a coherent motion of a vibrational wavepacket with a period of ∼150 fs. Our disordered exciton model allows a quantitative interpretation of the observed reequilibration processes occurring in these antennas.
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
发表时间：
1996
影响因子：
11.1
作者：
Nagarajan,V;Alden,RG;Williams,JC;Parson,WW
通讯作者：
Parson,WW
影响因子：
3.4
作者：
Hsin, Jen;Gumbart, James;Schulten, Klaus
通讯作者：
Schulten, Klaus