A coherent-inelastic-neutron-scattering experiment was performed on liquid D₂O at room temperature. We observe for the first time the collective high-frequency sound mode as predicted by computer molecular-dynamics simulations. We interpret the excitation to be a mode propagating within the hydrogen-bonded patches existing in liquid water, and distinct from the ordinary sound wave.
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Teixeira et al. (1985) studied this question.
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