Abstract
AbstractThe depolarized light scattering from 3 to 300 cm−1 has been studied for aqueous solutions of the halogen acids over a wide range of concentrations. The scattering profiles are interpreted on the basis of a four band component model in which two of the bands are centred on the exciting line and there are two shifted frequencies of ∼60 and ∼180 cm−1. The width of the bands is found not to give a measure of the cooperative rotational relaxation but is related to the decrease in dynamic coupling of oscillators in the network because of the presence of foreign ions. The intensity variations are dominated by polarizability fluctuations from both polarizable anions and the hydrated proton. The influence of the proton is similar to that of the iodide ion. There is also evidence for a reinforcement of local order at low electrolyte concentration.
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