Dokter Adriaan M, Woutersen Sander, Bakker Huib J
FOM Institute for Atomic and Molecular Physics [AMOLF], Kruislaan 407 Amsterdam, The Netherlands.
Phys Rev Lett. 2005 May 6;94(17):178301. doi: 10.1103/PhysRevLett.94.178301. Epub 2005 May 5.
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 T1 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.
我们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。对于包含10 - 15个水分子的最小纳米液滴，O - H伸缩振动的寿命T1等于0.85±0.1皮秒，这比大块液态水中的寿命长3倍多。我们发现水的氢键网络的截断导致了弛豫机制的显著变化。
