Collective modes in molten alkaline-earth bromides. Light scattering

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Abstract
Light scattering spectra in the energy-transfer range 4< nu -1 have been measured for molten MgBr2, CaBr2, SrBr2 and BaBr2. The spectra are similar to those found for the molten alkaline-earth chlorides. First-order Raman scattering gives a central peak, whose width is determined by dissipative effects such as electrical conduction, and a noncentral peak or shoulder whose frequency is of the order expected for TO modes in the corresponding crystals. In the case of MgBr2 the peak is well resolved and in CaBr2 it is almost resolved. Second-order Raman scattering gives an exponential tail at high frequencies. The spectra have been fitted with the semi-empirical model of Bunten and co-workers (1984) in order to derive the relaxation times associated with these contributions to the scattering. In Mg2+ and Ca2+ salts, where the noncentral contribution is completely polarised, its frequency scales linearly with reduced mass.

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