However, these experiments cannot directly resolve the motion of the atomic positions and require difficult translation of spectral dynamics into hydrogen bond dynamics. Most existing knowledge of vibrational relaxation in water is built upon ultrafast spectroscopy experiments 2, 3, 4, 5, 6, 7. An accurate description of the ultrafast vibrational motion of water molecules is essential for understanding the nature of hydrogen bonds and many solution-phase chemical reactions. Many anomalous properties of liquid water originate from its well-connected hydrogen bond network 1, including unusually efficient vibrational energy redistribution and relaxation 2. Water is one of the most important, yet least understood, liquids in nature. Nature volume 596, pages 531–535 ( 2021) Cite this article Direct observation of ultrafast hydrogen bond strengthening in liquid water
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