Abstract
By using a modified perturbation expansion to resolve the commutator nest, the complex polarizability of chromophore aggregates was expressed in the coupled resolvent form adaptable to take account of the incoherent dynamic interaction arising from the interference between the positive- and the negative-frequency parts of the light scattering by chromophores. Furthermore, with the help of the ensemble-averaged resolvent matrix method, the imaginary part of the complex polarizability matrix needed to calculate the absorptive spectral function of chromophore aggregates was formulated as a simplified analytical function of the chromophore's bandshape distorted out of its original shape by frequency modulation coming from the incoherent dynamic interaction. The utility of this formulation was shown by applying it to calculation of the absorption intensity and the circular dichroism bandshape of chromophore aggregates modelled on the fundamental helical geometries of polynucleotides. The above calculation gave new information about the effect of the incoherent dynamic interaction upon the hypochromic change of the total absorption intensity and upon the nonconservative distortion of the circular dichroism bandshape.
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