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.

中文翻译：

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使用受激拉曼散射洞察水和氯化钠溶液的液体结构

通过将氯化钠（NaCl）溶解在液态水中，我们实现了受激拉曼散射（SRS）的明显增强。与纯水相比，性能改善包括光谱净化，拉曼增益提高，泵浦阈值下降以及转换效率提高。在最佳的SRS结果中，泵阈值降低了45 {％}，最大转换效率提高了10.4 {％}。然后，水成为产生窄带光的典型拉曼散射介质。此外，我们发现可以通过结合SRS原理并通过分析SRS光谱来详细分析水和NaCl溶液的整体结构。在水中，OH拉伸带被证明是不同水簇中拉伸模式的叠加。对于解决方案，${}^{-}$可以直接获得离子，并使用SRS光谱研究了其相对于溶质浓度的变化。溶液的卓越SRS特性源自Cl周围的水合壳${}^{-}$离子。这项工作表明，SRS是鉴定水和NaCl溶液中结构的一种有前途的方法，并且可以很容易地扩展到其他液体和溶液中。{一世。