Nanoshock wave enhancement on stimulated Raman scattering of liquid water in dilute ethanol–water solutions,Journal of Raman Spectroscopy

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Nanoshock wave enhancement on stimulated Raman scattering of liquid water in dilute ethanol–water solutions
Journal of Raman Spectroscopy ( IF 2.4 ) Pub Date : 2020-11-05 , DOI: 10.1002/jrs.6031
Ying Wang ₁ , Fabing Li ₁ , Chong Wang ₁ , Pengfei Shen ₂ , Chenglin Sun ₁ , Wenhui Fang ₃ , Zhiwei Men ₁

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Stimulated Raman scattering (SRS) of OH stretching vibrations in pure water and dilute ethanol–water solutions under different pump laser energies has been investigated using Nd:YAG laser. Two characteristic peaks at about 3252 and 3390 cm⁻¹ are observed in mixture solutions, indicating the formation of strong and weak hydrogen bonds in water. A new shoulder peak at 3350 cm⁻¹ appears in the mixture solutions at high laser energy due to the enhancement of hydrogen bond structure of water molecules. Simultaneously, the normalized SRS intensity of mixture solutions is higher than that of pure water at the same laser energy. These results indicate that SRS of water molecules is enhanced in dilute ethanol–water solutions. We propose that the mechanism is the reduction of the laser breakdown threshold of liquid water via ethanol, resulting in a strong nanoshock wave, thereby enhancing the SRS of water.

中文翻译：

纳米冲击波增强稀乙醇水溶液中液态水的受激拉曼散射

使用Nd：YAG激光器研究了纯水和稀乙醇水溶液中的OH拉伸振动的受激拉曼散射（SRS）。在混合溶液中观察到约3252和3390 cm ^-1处的两个特征峰，表明在水中形成了强氢键和弱氢键。在3350 cm ^-1处出现新的肩峰由于水分子氢键结构的增强，在高激光能量下会出现在混合溶液中。同时，在相同的激光能量下，混合溶液的归一化SRS强度要高于纯水的归一化SRS强度。这些结果表明，在稀乙醇水溶液中水分子的SRS增强。我们认为其机理是通过乙醇降低液态水的激光击穿阈值，从而产生强的纳米冲击波，从而增强了水的SRS。

更新日期：2020-11-05

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