Optical Spectra of Orientationally Disordered Crystals. IV. Effects of Short-Range Correlation of Orientations

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Abstract
The infrared spectrum of an orientationally disordered crystal in which there is a short‐range correlation in the dipole moment derivatives with respect to the internal coordinates is discussed theoretically, and equations of general validity are derived. Numerical discussions are given of the spectrum of a linear chain, a square planar array, and a simple cubic array of molecules in which the short‐range correlation is describable by a single parameter.