Anomalous slowing down of the vibrational relaxation of liquid water upon nanoscale confinement
Anomalous slowing down of the vibrational relaxation of liquid water upon nanoscale confinement
复制标题
DOI：
10.1103/physrevlett.94.178301
复制
发表时间：
2005-05-06
影响因子：
8.6
通讯作者：
Bakker, HJ
中科院分区：
文献类型：
--
作者：
Dokter, AM;Woutersen, S;Bakker, HJ
利用飞秒双色中红外泵浦探测光谱研究了液态水纳米液滴的振动动力学。对于含有10-15个水分子的最小纳米液滴，O-H拉伸振动的寿命T-1等于0.85±0.1 ps，是散装液态水的3倍多。我们发现水的氢键网络的截断导致了弛豫机制的剧烈变化。
We study the vibrational dynamics of nanodroplets of liquid water with femtosecond two-color midinfrared pump-probe spectroscopy. For the smallest nanodroplet, containing 10-15 water molecules, the lifetime T-1 of the O-H stretch vibrations is equal to 0.85± 0.1 ps, which is more than 3 times as long as in bulk liquid water. We find that the truncation of the hydrogen-bond network of water leads to a dramatic change of the relaxation mechanism.