Abstract
It is customary in the discussion of infrared spectra of molecular solids, and of ionic solids containing polyatomic ions, to divide the normal vibrations of the nuclei into two classes: (1) Lattice or external modes, low-frequency vibrations which are approximately motions of whole molecules, and (2) molecular or internal modes, high-frequency vibrations similar to the vibrations of free molecules. The observed spectra are then interpreted in terms of absorption by these fundamentals, and combination bands involving two or more fundamentals. In this paper we discuss combination bands between lattice modes and internal modes. It is shown that a certain amount of information about the intensity of such bands and their temperature dependence can be predicted without a solution to the complete dynamical problem of the lattice vibrations.
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