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空气-水界面处表面水与体相水之间的超快振动能量转移。

Ultrafast vibrational energy transfer between surface and bulk water at the air-water interface.

作者信息

Smits Marc, Ghosh Avishek, Sterrer Martin, Müller Michiel, Bonn Mischa

机构信息

FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ, Amsterdam, The Netherlands.

出版信息

Phys Rev Lett. 2007 Mar 2;98(9):098302. doi: 10.1103/PhysRevLett.98.098302. Epub 2007 Mar 1.

DOI:10.1103/PhysRevLett.98.098302
PMID:17359206
Abstract

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.

摘要

我们报告了一项关于纯水-空气界面处水的飞秒时间分辨研究。利用具有飞秒红外脉冲的表面特异性四阶非线性光学光谱，测量了氢键结合的界面水的O-H伸缩振动寿命。发现在3200至3500 cm(-1)频率范围内的振动寿命与体相水的非常相似，这表明表面水分子与体相水分子之间存在超快的振动能量交换。

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