激光诱导动态压力下碱金属氢氧化物水溶液中的受激拉曼散射和增强机制。

IF 3.2 2区 物理与天体物理 Q2 OPTICS
Optics express Pub Date : 2024-11-04 DOI:10.1364/OE.538171
Zhenguo Dou, Lu Xing, Haixin Wang, Wenhui Fang, Aijun Li, Erna Jia, Zhiwei Men
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引用次数: 0

摘要

在激光诱导的高压条件下,使用 Nd: YAG 激光研究了不同浓度的氢氧化锂-水/重水(LiOH-H2O/D2O)溶液中的受激拉曼散射(SRS)。光谱显示 SRS 信号显著增强,其特点是出现了低文数拉曼峰,液态水的 SRS 主峰向低频移动,从单峰演变为两个或三个峰,这表明形成了冰状结构。此外,归一化 SRS 强度高于纯水。在 LiOH 溶解过程中 SRS 信号的增强归因于 OH- 产生的氢键(HB,O-H:O)和单价 Li+ 产生的库仑电子相互作用之间的协同调制,这加强了 HB 相互作用,提高了拉曼增益系数,并诱导了类似于压力效应的结构改变。此外,密度的增加放大了激光诱导击穿(LIB)过程中的动态高压效应,进一步增强了 SRS 信号。这项研究为了解激光诱导压力条件下碱金属氢氧化物与 H2O/D2O 之间的相互作用机制提供了宝贵的见解,为理解和增强水溶液中的 SRS 效应提供了一种全面的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Stimulated Raman scattering and enhancement mechanisms in alkali metal hydroxide aqueous solutions under laser-induced dynamic pressure.

Stimulated Raman scattering (SRS) in lithium hydroxide-water/heavy water (LiOH-H2O/D2O) solutions with varying concentrations was investigated under laser-induced high-pressure conditions using an Nd: YAG laser. The spectra revealed a significant enhancement in SRS signals, characterized by the emergence of low-wavenumber Raman peaks and a shift of the main SRS peak of liquid water to lower frequencies, evolving from a single peak to two or three peaks, which suggested the formation of an ice-like structure. Additionally, the normalized SRS intensity was higher than that of pure water. The enhancement of SRS signals during LiOH dissolution was attributed to the cooperative modulation between hydrogen bonding (HB, O-H:O) by OH- and Coulombic electronic interactions generated by monovalent Li+, which strengthened HB interactions, increased the Raman gain coefficient, and induced structural modifications akin to pressure effects. Besides, the increased density amplified the dynamic high-pressure effects during the laser-induced breakdown (LIB) process, further boosting the SRS signals. This work provides valuable insights into the interaction mechanisms between alkali metal hydroxides and H2O/D2O under laser-induced pressure conditions, offering a comprehensive approach to understanding and enhancing the SRS effect in aqueous solutions.

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来源期刊
Optics express
Optics express 物理-光学
CiteScore
6.60
自引率
15.80%
发文量
5182
审稿时长
2.1 months
期刊介绍: Optics Express is the all-electronic, open access journal for optics providing rapid publication for peer-reviewed articles that emphasize scientific and technology innovations in all aspects of optics and photonics.
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