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Molecular-scale dynamics in sub- to super-critical water is studied withinelastic X-ray scattering and molecular dynamics simulations. The obtainedlongitudinal current correlation spectra can be decomposed into two maincomponents: a low-frequency (LF), gas-like component and a high-frequency (HF)component arising from the O--O stretching mode between hydrogen-bondedmolecules, reminiscent of the longitudinal acoustic mode in ambient water. Withincreasing temperature, the hydrogen-bond network diminishes and the spectralweight shifts from HF to LF, leading to a transition from liquid-like togas-like dynamics with rapid changes around the Widom line.

Two-component dynamics and the liquid-like to gas-like crossover in supercritical water