Brillouin scattering on noncrystalline ZnCl2

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Abstract
Measurements of Brillouin scattering spectra from liquid and glassy (300–600 °C, 25–130 °C) ZnCl2 are reported. High resolution Fabry–Perot spectroscopy has been used, and temperature as well as momentum transfer have been varied so as to go completely across the condition (Brillouin frequency)⋅(characteristic relaxation time)=1, where very non‐Lorentzian spectral shapes are observed. They are fully described by viscoelastic theory, i.e., a Mori‐form including fourth moment, two sound velocities, and relaxation times. Connection with current ideas on glass‐forming liquids is made.