Generic Structural Relaxation in Supercooled Liquids

One of the hallmarks molecular dynamics in deeply supercooled liquids is non-exponential character relaxation functions. It has been a long standing issue if 'universal' features govern lineshape glassy independent any particular structure or interaction. In paper, we elucidate this matter by giving comprehensive comparison spectral shape depolarized light scattering and dielectric data liquids. The spectra very different systems, e.g. hydrogen bonding van der Waals but also ionic almost perfectly superimpose show generic structural relaxation, approximately following high frequency power law $\omega^{-1/2}$ . However, loss peak shows more individual shape. systems with low dipole moment behavior observed spectra, while strongly dipolar additional crosscorrelation contributions mask relaxation.