Photosynthetic light harvesting by carotenoids: Detection of an intermediate excited state
Photosynthetic light harvesting by carotenoids: Detection of an intermediate excited state
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DOI：
10.1126/science.1074685
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发表时间：
2002-12-20
期刊：
影响因子：
56.9
通讯作者：
Cogdell, RJ
中科院分区：
文献类型：
--
作者：
Cerullo, G;Polli, D;Cogdell, RJ
我们首次提出了类胡萝卜素中存在中间单重态激发态(S-x)的直接证据，该激发态介导了类胡萝卜素从S-2到S-1的内部转换。S二号到S x号的转换速度极快，大约在50飞秒内完成。这些结果需要重新评估在光合作用的第一步从类胡萝卜素到叶绿素的能量传递途径。
We present the first direct evidence of the presence of an intermediate singlet excited state (S-x) mediating the internal conversion from S-2 to S-1 in carotenoids. The S-2 to S-x transition is extremely fast and is completed within approximately 50 femtoseconds. These results require a reassessment of the energy transfer pathways from carotenoids to chlorophylls in the primary step of photosynthesis.