期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 53, 期 31, 页码 8146-8149出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201402566
关键词
interfacial water; spectral diffusion; sum-frequency generation; two-dimensional spectroscopy; vibrational dynamics
资金
- Nederlandse organisatie voor Wetenschappelijk Onderzoek (NWO)
Water molecules interact strongly with each other through hydrogen bonds. This efficient intermolecular coupling causes strong delocalization of molecular vibrations in bulk water. We study intermolecular coupling at the air/water interface and find intermolecular coupling 1) to be significantly reduced and 2) to vary strongly for different water molecules at the interface-whereas in bulk water the coupling is homogeneous. For strongly hydrogen-bonded OH groups, coupling is roughly half of that of bulk water, due to the lower density in the near-surface region. For weakly hydrogen-bonded OH groups that absorb around 3500 cm(-1), which are assigned to the outermost, yet hydrogen-bonded OH groups pointing towards the liquid, coupling is further reduced by an additional factor of 2. Remarkably, despite the reduced structural constraints imposed by the interfacial hydrogen-bond environment, the structural relaxation is slow and the intermolecular coupling of these water molecules is weak.
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