We report a femtosecond time-resolved study of water at the neat water-air interface. The O-H stretch vibrational lifetime of hydrogen-bonded interfacial water is measured using surface-specific 4th-order nonlinear optical spectroscopy with femtosecond infrared pulses. The vibrational lifetime in the frequency range of 3200 to 3500 cm-1 is found to closely resemble that of bulk water, indicating ultrafast exchange of vibrational energy between surface water molecules and those in the bulk.

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Persistent URL dx.doi.org/10.1103/physrevlett.98.098302
Journal Phys. Rev. Lett.
Smits, M, Ghosh, A, Sterrer, M, Müller, M, & Bonn, M. (2007). Ultrafast vibrational energy transfer between surface and bulk water at the air-water interface. Phys.Rev.Lett., 98(Article number: 98302), 1–4. doi:10.1103/physrevlett.98.098302