Nairn J A, Friesner R, Frank H A, Sauer K
Biophys J. 1980 Nov;32(2):733-53. doi: 10.1016/S0006-3495(80)85013-2.
We have developed a new approach to the theory of linear dichroism in partially ordered systems. The description of the partially ordered ensemble uses a density of states function, D(theta, phi, approximately delta), which gives the probability that the direction of polarization for incident polarized light has spherical angles theta and phi in an axis system fixed with respect to the molecule; approximately delta = (delta 1, delta 2...delta n) is a set of parameters that describes the partial ordering. We derive new formulas for linear dichroism using the density of states function and then apply these formulas to the analysis of linear dichroism in reaction centers and whole cells of photosynthetic bacteria. One advantage of our approach is that the order parameter, approximately delta, provides a more complete description of the distribution function than the traditional order parameters used by other authors. Knowledge of approximately delta gives a good physical description of the partial ordering and allows one to calculate accurate limits for the range of possible orientations of the transition moments.
我们已开发出一种用于部分有序系统中线性二色性理论的新方法。对部分有序系综的描述使用了态密度函数D(θ, φ, 近似δ)，它给出了在相对于分子固定的轴系中，入射偏振光的偏振方向具有球坐标θ和φ的概率；近似δ = (δ₁, δ₂...δₙ)是一组描述部分有序性的参数。我们利用态密度函数推导出线性二色性的新公式，然后将这些公式应用于光合细菌反应中心和整个细胞中线性二色性的分析。我们方法的一个优点是，序参量近似δ比其他作者使用的传统序参量能更完整地描述分布函数。了解近似δ能对部分有序性给出很好的物理描述，并使人们能够计算跃迁矩可能取向范围的准确界限。
