Pastorczak Marcin, Kozanecki Marcin, Ulanski Jacek
J Phys Chem A. 2008 Oct 30;112(43):10705-7. doi: 10.1021/jp805369p. Epub 2008 Oct 4.
Raman spectroscopy is a technique preferably used for studies of water structure because the proportions of intensities of main OH stretching modes are thought to reflect well a network of "intermonomer" hydrogen bonds as well as its disturbance by the presence of some solutes. The work presented herein demonstrates how the intensity ratio of two main components (around 3200 and 3400 cm (-1)) depends on the excitation wavelength in the visible range. Polarized Raman spectra indicate that the component at ca. 3200 cm (-1) is in resonance with light from the red range, which is in agreement with the presence of vibrational overtones in UV-vis absorption spectrum of water. These results are the first report on the occurrence of the Raman resonance effect in liquid water.
拉曼光谱法是一种特别适用于研究水结构的技术，因为人们认为主要的OH伸缩振动模式的强度比例能够很好地反映“单体间”氢键网络以及某些溶质的存在对其造成的干扰。本文所展示的研究表明，两个主要成分（约3200和3400 cm⁻¹）的强度比如何取决于可见光范围内的激发波长。偏振拉曼光谱表明，约3200 cm⁻¹处的成分与来自红色波段的光发生共振，这与水的紫外可见吸收光谱中存在振动泛音相一致。这些结果是关于液态水中拉曼共振效应的首次报道。
