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Employing wide-angle neutron spin echo spectroscopy, we measured theQ-dependent coherent intermediate scattering function of the prototypical ionicglass former Ca0.4K0.6(NO3)1.4, in the equilibrium and supercooled liquidstates beyond the hydrodynamic regime. The data reveal a clear two-steprelaxation: an exponential fast process, and a stretched exponential slow alphaprocess. de Gennes narrowing is observed in all characteristic variables of thealpha process: the relaxation time, amplitude, and stretching exponent. At alllength scales probed, the relative amplitude of the alpha-relaxation decreaseswith increasing temperature and levels off in the normal liquid state. Thetemperature dependence of the stretching exponent and the relaxation time atdifferent Q's indicate that modifications of the relaxation mechanisms at thelocal length scales, manifested as temperature independent dynamicheterogeneity and smaller deviations from Arrhenius behavior, have occurredeven above the alpha-beta (Johari-Goldstein) bifurcation temperature.

Q-dependent Collective Relaxation Dynamics of Glass-Forming Liquid Ca0.4K0.6(NO3)1.4 Investigated by Wide-Angle Neutron Spin-Echo