Line shape studies of a state coupled to a random background including large fluctuations of the couplings.
Line shape studies of a state coupled to a random background including large fluctuations of the couplings.
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与随机背景耦合的状态的线形研究，包括耦合的大波动。
DOI：
10.1063/1.2771174
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
S. Fischer
中科院分区：
文献类型：
--
作者：
W. Dietz;S. Fischer
分析了一个模型系统的线形函数，描述了一个振子携带态与能量随机分布的背景态耦合，耦合常数随机。根据能量分布函数或耦合分布的性质，不同的线形函数，如洛伦兹函数，Fano函数，或与福斯特型的非指数衰减相关的线形函数被恢复为极限情况。推导了特别引入的均方耦合近似适用范围的条件。它表明，洛伦兹线的形状的外观并不直接意味着一个均匀的衰变机制，另一方面，普遍接受的条件，所谓的统计极限，表示在平均密度和平均耦合，不一定导致洛伦兹线的形状。这是通过随机分布的过渡偶极耦合模型分析说明。其他应用涉及蛋白质中的光谱扩散和桥接电荷转移。
Line shape functions of a model system are analyzed, describing an oscillator carrying state coupled to background states randomly distributed in energy and with random coupling constants. Depending on the energy distribution functions or the nature of the coupling distribution, different line shape functions, such as the Lorentzian, the Fano, or that related to the nonexponential decay of the Forster type are recovered as limiting cases. Conditions for the range of applicability of a specially introduced mean square coupling approximation are derived. It is shown that the appearance of a Lorentzian line shape does not imply directly a homogeneous decay mechanism and that, on the other hand, commonly accepted conditions for the so-called statistical limit, expressed in terms of an average density and an average coupling, do not necessarily lead to a Lorentzian line shape. This is illustrated analytically through a model with randomly distributed transition dipolar couplings. Other applications relate to spectral diffusion in proteins and to bridged charge transfer.
DOI：
10.1146/annurev.bb.17.060188.002315
发表时间：
1988
期刊：
Annual review of biophysics and biophysical chemistry
影响因子：
--
作者：
H. Frauenfelder;F. Parak;R. Young
通讯作者：
H. Frauenfelder;F. Parak;R. Young