ArticleLangmuir : the ACS journal of surfaces and colloids2024
How Thick is the Air-Water Interface?─A Direct Experimental Measurement of the Decay Length of the Interfacial Structural Anisotropy.
Article in Langmuir : the ACS journal of surfaces and colloids, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers.
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Who cites it
11 citing papers in PubMed.
- Visible light leaves evaporation and interfacial structure of neat water unchanged at the air-water interface.Proceedings of the National Academy of Sciences of the United States of America · 2026Article
- Spiers Memorial Lecture: Vibrations at interfaces.Faraday discussions · 2026Article
- Cation-Induced Interphasial Viscosity Variations on Gold Electrocatalysts in Nanoconfined Aqueous Electrolytes.Journal of the American Chemical Society · 2026Article
- Multipolar electric and magnetic contributions to sum-frequency generation spectra reveal biaxial interfacial water structure.Nature communications · 2026Article
- Anisotropic Water Structure at Charged Interfaces Studied by Depth-Resolved Vibrational SFG/DFG Spectroscopy.Journal of the American Chemical Society · 2026Article
- The importance of layer-dependent molecular twisting for the structural anisotropy of interfacial water.Science advances · 2026Article
- Breaking the Air-Water Paradigm: Ion Behavior at Hydrophobic Solid-Water Interfaces.Journal of the American Chemical Society · 2026Article
- Competing hydrogen-bond orders drive water's anomalous surface tension.Nature communications · 2026Article
- Reevaluating Anomalous Electric Fields at the Air-Water Interface: A Surface-Specific Spectroscopic Survey.Journal of the American Chemical Society · 2025Article
- Interfaces govern the structure of angstrom-scale confined water solutions.Nature communications · 2025Article
- Frequency-Dependent Vibrational Relaxation Time of OH Stretch at the Air/Isotopically Diluted Water Interface.The journal of physical chemistry letters · 2025Article
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Authors and funding
7 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The air-water interface is a highly prevalent phase boundary impacting many natural and artificial processes. The significance of this interface arises from the unique properties of water molecules within the interfacial region, with a crucial parameter being the thickness of its structural anisotropy, or "healing depth". This quantity has been extensively assessed by various simulations which have converged to a prediction of a remarkably short length of ∼6 Å. Despite the absence of any direct experimental measurement of this quantity, this predicted value has surprisingly become widely accepted as fact. Using an advancement in nonlinear vibrational spectroscopy, we provide the first measurement of this thickness and, indeed, find it to be ∼6-8 Å, finally confirming the prior predictions. Lastly, by combining the experimental results with depth-dependent second-order spectra calculated from ab initio parametrized molecular dynamics simulations, which are also in excellent agreement with this experimental result, we shed light on this surprisingly short correlation length of molecular orientations at the interface.
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