2020/08/31 by Peihao Sun, J. B. Hastings, Daisuke Ishikawa +3 · 22 citations
Chemistry · Engineering · Physics and Astronomy · #Analytical Chemistry and Chromatography #Artificial intelligence #Biological system #Biology #Chemical physics #Component (thermodynamics) #Computer science #Crossover #Dynamics (music) #Materials science #Molecular dynamics #Phase Equilibria and Thermodynamics #Physics #Quantum mechanics #Statistical physics #Subcritical and Supercritical Water Processes #Supercritical fluid #Thermodynamics #cond-mat.soft
paper · pdf · doi:10.1103/physrevlett.125.256001
published in Physical Review Letters 125(25), 256001 (American Physical Society) · 7 pages, 4 figures
arxiv created 2020/11/13 · openalex publication_date 2020/12/14 · arxiv updated 2020/12/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Molecular-scale dynamics in sub- to supercritical water is studied with inelastic x-ray scattering and molecular dynamics simulations. The obtained longitudinal current correlation spectra can be decomposed into two main components: a low-frequency (LF), gaslike component and a high-frequency (HF) component arising from the O-O stretching mode between hydrogen-bonded molecules, reminiscent of the longitudinal acoustic mode in ambient water. With increasing temperature, the hydrogen-bond network diminishes and the spectral weight shifts from HF to LF, leading to a transition from liquid- to gaslike dynamics with rapid changes around the Widom line.