机器学习加速分子动力学模拟揭示了空气-水界面自由OH放松的机制
Hujun Shen1, Ling Chen1, Hengxiu Yang1
1Guizhou Provincial Key Laboratory of Key Materials and Devices for Solid-State Batteries, Guizhou Provincial Key Laboratory of Computational Nano-Material Science, Guizhou Education University, Guiyang 550018, China.
The Journal of chemical physics
|February 19, 2026
概括
振动总频生成 (VSFG) 光谱显示,分子内能量转移 (IET) 和重定向 (REOR) 在空气-水界面对自由的O-H群具有相似的影响. 核量子效应加快了这些放松过程.
科学领域:
- 表面科学是一门科学.
- 物理化学 物理化学
- 计算光谱学是一种计算光谱学.
背景情况:
- 振动总频生成 (VSFG) 光谱是研究界面上的OH群动态的关键.
- 关于分子内能量转移 (IET) 或重定向 (REOR) 是否主导空气-水界面的OH放松存在争议.
研究的目的:
- 研究空气-水界面上的自由O-H群体的主导振动放松机制 (IET和REOR).
- 使用先进的模拟技术量化IET和REOR的时间表.
主要方法:
- 机器学习加速分子动力学 (MD) 模拟利用深潜力 (DP) 模型.
- 从基于DP的MD模拟中计算VSFG和状态振动密度 (VDOS) 光谱.
- 对界面自由O-H组的IET和REOR时间表的分析.
主要成果:
- VSFG和VDOS光谱显示了不同的键和自由O-H波段.
- 模拟IET时间尺度为~800 fs,REOR时间尺度为~900 fs,用于界面自由O-H组.
- 核量子效应被发现可以显著加速IET和REOR过程.
结论:
- IET和REOR都对空气-水界面上的自由OH组的能量消耗有相应的贡献.
- 核量子效应加速放松的程度取决于键的定义.
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