Abstract
The double-proton exchange in carboxylic acids has been studied for a polycrystalline sample of ring-deuterated terephthalic acid (TA), HOOC-C6Da-COOH' and for both single-crystal and polycrystalline samples of acetylene dicarboxylic acid (ADA), HOOC-C2-COOH, by incoherent neutron scattering. For temperatures above 100K the observed energy spectra reveal quasielastic contributions which indicate that the disorder of the hydrogen-bonded dimeric units is of dynamic nature involving a translational jump across the hydrogen bonds. The data have been analysed in terms of a two-site jump model. Jump vectors, relaxation rates and population factors within the asymmetric double-minimum potential have been derived.
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