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We investigate the presence of an acoustic-quasi-elastic interactioncontribution in the IXS spectra of liquid water at 301K using inelastic x-rayscattering with sub-meV energy resolution at momentum transfers 0.77<=Q<=4.20/nm. The contribution appears due to the overlap the acoustic mode with thetail the quasi-elastic mode and is fully consistent with hydrodynamic theory.Incorporating this interaction allows us to describe the dynamic structurefactor, S(Q,w), without introducing an extra mode, and may help explain earliercontradictory interpretations. The sound velocity, and relative intensity ofthe quasi-elastic and acoustic mode, plateau for Q>2/nm at values consistentwith a viscoelastic generalization of the Landau-Placzek relation.

Interaction of Acoustic and Quasi-Elastic Modes in Liquid Water on Nanometer Length Scales