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Insight into the liquid structure of water and sodium-chloride solutions using stimulated Raman scattering
Physical Review Applied ( IF 4.532 ) Pub Date : 
Zhixin Wu, Zhengping Wang, Xun Sun, Lisong Zhang, Mingxia Xu, and Xinguang Xu

By dissolving sodium chloride (NaCl) into liquid water, we realized the obvious enhancement of stimulated Raman scattering (SRS). Comparing with pure water, the performance improvements included spectrum purification, elevated Raman gain, descending pump threshold, and increased conversion efficiency. In the best SRS results, the pump threshold decreased by 45{%} and the maximum conversion efficiency increased by 10.4{%}. Then, water becomes a typical Raman scattering medium that generates a narrow-band light. Moreover, we found that the bulk structure of water and NaCl solutions could be analyzed in detail by combining the principles of SRS and through analysis of the SRS spectra. In water, the O-H stretching band was proved to be the superposition of stretching modes in different water clusters. For the solution, the O-H stretching vibration of water molecules in hydration shells around Cl− ions can be obtained directly and its variation with respect to solute concentration was investigated using the SRS spectra. The superior SRS properties of solutions originated from the hydration shell around the Cl− ions. This work suggests that the SRS is a promising approach to identifying structures in water and NaCl solutions, and that it can easily be extended to other liquids and solutions. {I.
更新日期:2020-01-09

 

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