Proving coexistence of ice‐like and quartz‐like structure in localized liquid water by stimulated Raman scattering

Liquid water is a complex system consisting of ice‐like and quartz‐like structure based on the classic two‐state model. Although lots of theoretical work have been developed about this model, the experimental evidences are still needed. Herein, a 355‐nm pulse laser is employed to excite stimulated R...

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Bibliographic Details
Published in:Journal of Raman spectroscopy 2019-12, Vol.50 (12), p.1956-1961
Main Authors: Wang, Shenghan, Fang, Wenhui, Li, Fabing, Wang, Ying, Yang, Bo, Lang, Hongzhi, Cao, Xianwen, Li, Zhanlong, Sun, Chenglin, Men, Zhiwei
Format: Article
Language:English
Subjects:
Coexistence
Complex systems
Diffusion coefficient
High pressure
Ice
ice‐like structure
liquid water
Pressure
Pressure dependence
Quartz
quartz‐like structure
Raman spectra
Shock waves
stimulated Raman scattering
Surface water
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Summary:Liquid water is a complex system consisting of ice‐like and quartz‐like structure based on the classic two‐state model. Although lots of theoretical work have been developed about this model, the experimental evidences are still needed. Herein, a 355‐nm pulse laser is employed to excite stimulated Raman scattering (SRS) of liquid water both in bulk and on surface, with the generation of shockwave‐induced dynamic high pressure. Two characteristic features Raman peaks of both spontaneous Raman and SRS indicate the coexistence of two structures in localized water area. The ice‐like structure corresponds to ice Ih phase under the presented conditions, because the pressure dependence behavior of Raman shift agree well with the anomaly of diffusion coefficient of ice Ih phase, when the shock wave‐induced dynamic high pressure forms. Two structures show different pressure‐dependent behaviors based on the SRS results; meanwhile, the distribution of two structures is different in bulk and on surface water. The two‐state model of liquid water is demonstrated by both spontaneous Raman spectra and stimulated Raman spectra. The ice‐like structure of liquid water belong to ice Ih by analyzing frequency shift of corresponding Raman feature under stimulated Raman scattering. The difference of hydrogen bond between bulk water and surface water is investigated by stimulated Raman spectra.
ISSN:0377-0486
1097-4555
DOI:10.1002/jrs.5730