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A theoretical model is proposed for symmetric dimers of carboxylic acids which accounts for three effects on an equal footing : (i) coupling between the high and low-frequency modes ; (ii) Davydov-type splitting of the degenerate vibrational states ; and (iii) Fermi resonance between the hydrogen-stretching fundamental and the first overtone of the hydrogen bending. These three mechanisms contribute to the infra-red spectra which have been computed for different values of an anharmonic parameter.
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Marek J. Wójcik (1978) studied this question.
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