Hydrogen bonding carboxylic acid line shapes

Cyclic dimers of carboxylic acids represent important model systems forming two coupled intermolecular hydrogen bonds [Fig. 15.1 (d), inset of Fig. 15.4]. The linear vibrational spectra of carboxylic acid dimers have been studied in detail, both in the gas and the liquid phase, and a substantial theoretical effort has been undertaken to understand the line shape of their 0-H and/or O-D stretching bands. In contrast, there have been only a few experiments on the nonlinear vibrational... 

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