Quantum Coherence Enabled Determination of the Energy Landscape in Light-Harvesting Complex II
Quantum Coherence Enabled Determination of the Energy Landscape in Light-Harvesting Complex II
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DOI：
10.1021/jp908300c
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发表时间：
2009-12-24
影响因子：
3.3
通讯作者：
Fleming, Graham R.
中科院分区：
文献类型：
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作者：
Calhoun, Tessa R.;Ginsberg, Naomi S.;Fleming, Graham R.
光合作用中能量转移的近乎一致的效率使得光合作用光捕获复合物成为开发新的可再生能源技术的有希望的途径。了解这些复合物的能量景观对于理解它们的功能至关重要，但其实验测定已被证明难以捉摸。在这里，利用二维电子光谱对量子相干性的观察，直接测量了光捕获复合体II（LHCII）中14个最低电子能级，这是植物中最丰富的天线复合体，含有世界上约50%的叶绿素。我们观察到电子激发态分布相对均匀，突出了光合复合体的一个重要设计原理，解释了在LHCII中观察到的超快复合体内能量转移。
The near-unity efficiency of energy transfer in photosynthesis makes photosynthetic light-harvesting complexes a promising avenue for developing new renewable energy technologies. Knowledge of the energy landscape of these complexes is essential in understanding their function, but its experimental determination has proven elusive. Here, the observation of quantum coherence using two-dimensional electronic spectroscopy is employed to directly measure the 14 lowest electronic energy levels in light-harvesting complex II (LHCII), the most abundant antenna complex in plants containing approximately 50% of the world's chlorophyll, We observe that the electronically excited states are relatively evenly distributed, highlighting an important design principle of photosynthetic complexes that explains the observed ultrafast intracomplex energy transfer in LHCII.