Fifth order Raman scattering is extremely sensitive to anharmonicities and nonlinear polarizabilities and thus provides a unique probe of the many-body potential of Liquids. The weak signals from this high order, chi((5)), process are complicated by cascaded lower-order chi((3)) processes. A new approach has reduced the beam delivery to a single diffractive optic that generates the beam pattern for phase-matched six-wave mixing, and passively phase Locks all six fields. Heterodyne detection introduces signal amplification and phase contrast against lower-order nonlinearities. The findings provide new Insight into the nature of the direct chi((5)) nonlinear response function and two-time correlation of liquids.