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arXiv 1811.09112physics.chem-phstat.ML
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机器学习使长时间尺度的分子光动力学模拟成为可能

Machine learning enables long time scale molecular photodynamics simulations

Julia Westermayr, Michael Gastegger, Maximilian F. S. J. Menger, Sebastian Mai, Leticia González, Philipp Marquetand

摘要:

光诱导过程在自然界中是基本的,但精确的模拟受到基础量子化学计算成本的严重限制,阻碍了它们在长时间尺度上的应用。在这里,我们介绍了一种基于机器学习的方法来克服这一瓶颈,并实现纳秒时间尺度上的精确光动力学,这是当代方法无法达到的。在分子动力学模拟过程中,我们使用深度神经网络来学习分子几何形状与其高维电子性质之间的关系,而不是昂贵的量子化学。作为一个例子,一纳秒的亚甲基铵阳离子的时间演化被用来证明机器学习算法可以在其计算效率方面优于标准的激发态分子动力学方法,同时提供相同的精度。

英文摘要:

Photo-induced processes are fundamental in nature, but accurate simulations are seriously limited by the cost of the underlying quantum chemical calculations, hampering their application for long time scales. Here we introduce a method based on machine learning to overcome this bottleneck and enable accurate photodynamics on nanosecond time scales, which are otherwise out of reach with contemporary approaches. Instead of expensive quantum chemistry during molecular dynamics simulations, we use deep neural networks to learn the relationship between a molecular geometry and its high-dimensional electronic properties. As an example, the time evolution of the methylenimmonium cation for one nanosecond is used to demonstrate that machine learning algorithms can outperform standard excited-state molecular dynamics approaches in their computational efficiency while delivering the same accuracy.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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