Spectral fine-tuning in excitonically coupled cyclic photosynthetic antennas
Spectral fine-tuning in excitonically coupled cyclic photosynthetic antennas
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DOI：
10.1016/j.cplett.2010.09.084
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发表时间：
2010-11-10
影响因子：
2.8
通讯作者：
Trinkunas, Gediminas
中科院分区：
文献类型：
--
作者：
Freiberg, Arvi;Timpmann, Kou;Trinkunas, Gediminas
光合生物对环境变化的适应性是众所周知的，但其潜在的物理机制却鲜为人知。在这里，我们研究的机制，负责非常大的（类似于50 nm）蓝移的最低能量吸收带的应力LH3天线形式从光合细菌Rhodopyramidophila相比，其位置在常规LH2天线。天线的吸收和偏振荧光激发光谱在5 K下测量的分析，天线激子的基本修改已被揭示，涉及激子带的相对变窄和移位。(C)2010爱思唯尔有限公司版权所有。
Photosynthetic organisms are famously adaptable to environmental variances, yet the underlying physical mechanisms are seldom known. Here, we study the mechanisms that are responsible for the very large (similar to 50-nm) blue shift of the lowest-energy absorption band in the stressed LH3 antenna form from the photosynthetic bacterium Rhodopseudomonas acidophila compared to its position in regular LH2 antenna. By analyses of the antenna absorption and polarized fluorescence excitation spectra measured at 5 K, essential modifications of the antenna excitons have been revealed that involve both relative narrowing and shifting of the exciton band. (C) 2010 Elsevier B.V. All rights reserved.