Abstract
B+H⋯B⇌B⋯H+B or AH⋯B⇌−A⋯H+B hydrogen bonds, respectively, with double minimum proton potential well or broad flat potential well cause continuous absorptions in the infrared spectra. The intensity of these infrared continua is often very large, i.e. their integrated intensity is much larger than that of infrared bands. Short strong hydrogen bonds with broad flat in the average largely symmetrical proton potentials in which the protons fluctuate, show so-called proton polarizabilities. With such systems, the infrared continua extend in the far infrared region, i.e. in the region below 600cm−1. It is, however known that with such bonds no proton transitions occur in this region.It is demonstrated that the intensity of these infrared continuous absorptions is strongly increased by the coupling of the hydrogen bonds with large proton polarizability with the phonons of the thermal bath around these hydrogen bonds. Further, it is demonstrated that the pronounced absorption in the far infrared region, i.e. the region below 600cm−1, occurs due to the strong coupling of these hydrogen bonds to the polaritons. The polaritons are the quanta of the thermal bath coupled to the phonons of the thermal bath.
Published Version
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