基于神经网络的总频率生成光谱,纯净和酸性水与空气的接口
Miguel de la Puente1, Axel Gomez1, Damien Laage1
1PASTEUR, Department of Chemistry, École Normale Supérieur, PSL University, Sorbonne Université, CNRS, 75005 Paris, France.
The journal of physical chemistry letters
|March 12, 2024
概括
离子 (H3O+) 喜欢空气-水接口,影响总频生成 (SFG) 频谱. 模拟显示了由于酸性溶液中的振动和偏振效应引起的离子诱导的光谱变化.
科学领域:
- 环境化学环境化学
- 物理化学 物理化学
- 表面科学是一门学科.
背景情况:
- 空气-水接口的行为在环境过程中至关重要.
- 总频生成 (SFG) 光谱学表明离子 (H3O+) 有利于这种接口.
- 酸性水中SFG光谱变化的分子起源尚不清楚.
研究的目的:
- 阐明在酸化水中SFG光谱变化背后的分子机制.
- 为了确定离子在空气-水界面上的作用.
- 将界面离子行为与可观测的光谱信号联系起来.
主要方法:
- 纳米秒长的神经网络 (NN) 对水板的反应模拟.
- 对分子二极体和极化性的NN预测.
- 从反应轨迹计算SFG光谱,包括质子转移.
主要成果:
- 离子诱导H3O+的低频谱尾和其水化的振动.
- 由于离子诱导的较深水层的极化,出现了增强的结带.
- 模拟证实了离子的偏好的界面居住.
结论:
- 离子在空气-水接口上显著改变了SFG光谱.
- 观察到的光谱变化直接归因于接口离子.
- 该研究阐明了酸性水系统中SFG信号的分子基础.
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