Correlated fluctuations in the exciton dynamics and spectroscopy of DNA
Correlated fluctuations in the exciton dynamics and spectroscopy of DNA
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DOI：
10.1088/1367-2630/12/5/055005
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发表时间：
2010-05-21
影响因子：
3.3
通讯作者：
Tanimura, Yoshitaka
中科院分区：
文献类型：
--
作者：
Dijkstra, Arend G.;Tanimura, Yoshitaka
紫外线的吸收在DNA中产生激发，随后开始在螺旋中移动。它们的命运对于理解光损伤很重要，并且是由碱基之间的电子偶联和DNA环境结构的相互作用决定的。我们模拟了环境中动态波动的影响，并研究了当多个碱基对在环境中与相同模式相互作用时存在的相关性。我们发现这种相关性强烈地影响激子动力学，并展示了在非线性光学实验中，它们是如何在各向异性的衰减中作为相干性和填充时间的函数被观察到的。
The absorption of ultraviolet light creates excitations in DNA, which subsequently start moving in the helix. Their fate is important for an understanding of photodamage, and is determined by the interplay of electronic couplings between bases and the structure of the DNA environment. We model the effect of dynamical fluctuations in the environment and study correlation, which is present when multiple base pairs interact with the same mode in the environment. We find that the correlations strongly affect the exciton dynamics, and show how they are observed in the decay of the anisotropy as a function of coherence and population time in a nonlinear optical experiment.