从石墨烯中散射H原子的量子和经典分子动力学
Lei Shi1, Markus Schröder2, Hans-Dieter Meyer2
1Université Paris-Saclay, CNRS, Institut des Sciences Moléculaires d'Orsay UMR 8214, 91405 Orsay, France.
The Journal of chemical physics
|November 15, 2023
概括
经典分子动力学 (cMD) 和量子动力学 (QD) 对石墨烯中原子散射的模拟在高事件能量时显示出极小的差异. 然而,量子效应显著影响了低能量的粘合概率,突出了QD模拟的重要性.
科学领域:
- 计算化学的计算化学
- 表面科学是一门学科.
- 量子力学就是量子力学.
背景情况:
- 精确模拟原子表面相互作用对于理解表面化学和催化是至关重要的.
- 经典分子动力学 (cMD) 和量子动力学 (QD) 提供了不同的方法来建模这些相互作用.
- 准确的潜在能量表面 (PES) 的开发对于可靠的模拟是必不可少的.
研究的目的:
- 系统地比较经典分子动力学 (cMD) 和量子动力学 (QD) 对石墨烯原子散射的模拟.
- 调查发生动能对cMD和QD之间的差异的影响.
- 为了对量子动力学模拟与经典方法进行基准测试,以实现现实的,大规模的系统.
主要方法:
- 利用经过实验验证的,全维神经网络潜在能量表面 (PES) 进行H原子与24原子石墨烯细胞的相互作用.
- 应用蒙特卡洛规范的多态分解来将 PES 转换为 QD 模拟的产品和形式.
- 采用多层多配置时间依赖的Hartree (ML-MCTDH) 方法来模拟H或D原子的量子散射.
主要成果:
- 当事件H原子能量为1.96 eV时,在cMD和QD模拟之间观察到很小的差异.
- 在0.96 eV的H原子能量发生时,发现了粘合概率的显著差异,表明了量子效应.
- 在海德堡ML-MCTDH包中实现了新的投影仪,用于计算原子散射能量转移分布.
结论:
- 量子动力学模拟显示,在较低的事件能量下,在石墨烯上散射的H原子与经典模拟有显著的偏差.
- 该研究提供了量子与经典模拟对一个具有现实的PES的大系统的第一个基准比较.
- 这些发现强调了量子力学处理对于准确描述原子表面动态的重要性,特别是关于粘合概率.
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