Abstract
A theory is developed to describe a broad IR absorption which appears in the range of a high-frequency stretching vibration of the X-H group involved in the hydrogen bond in solids. The theory is based on the anharmonic coupling mechanism between the high-frequency hydrogen stretching vibration. ν(XH), and low-frequency lattice phonons. The theory was constructed in the framework of the molecular exciton Davydov approach. Model calculations show that the strong anharmonic couplings between the high-frequency ν(XH) and low lattice vibration frequencies generate the broadness of the ν(XH) band.
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