Exploring the state of overexpanded water in liquidography

In liquidopgraphy the reaction of the solvent can be described by a set of thermodynamic differentials in the linear approximation that allow to deduce the equation of state (p, V, T) unambiguously. This, however, breaks down for non-linear excitation, if for instance shock- or pressure waves are generated that exceed the first order approximation. We want to compare the direct photoexcitation of neat water to the previously found water relaxation in a colloid. In the latter, the overexpansion of the excited volume causes an increase of density fluctuations that emanate as a new scattering differential.