Theory of Hypochromism

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Abstract
A unified theory of complex refractive index in fluids is described. The theory shows that hypo‐ (or hyper‐) chromism is an inevitable consequence of significant anisotropic relative correlation. Formulas are quoted which contain, among other significant terms, the more general form of those given by Tinoco and others. Factors of dispersive refractive index and multiple‐scattering terms neglected in the previous treatments are shown to be important. Three alternative reasons why pronounced hypochromism may be accompanied by small frequency shifts in the dipole approximation are indicated: in general, hypochromism is accompanied by changes of band or line shapes as well as shifts of absorption maxima. A proof of a sum rule for integrated absorption in small isolated polymers is adumbrated: under less stringent conditions the sum rule appears to fail. The arguments are developed in much greater detail elsewhere.

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