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Atomic Spectroscopy: Effects of Temperature

Atomic Spectroscopy: Effects of Temperature

Atomization, converting samples into gas-phase atoms and ions, is essential for atomic spectroscopy. The flame temperature required for atomization affects the efficiency of the atomic spectroscopic methods by increasing the atomization efficiency and the relative population of the excited and ground states.
At thermal equilibrium, the relative populations of excited and ground state atoms can be estimated using the Maxwell–Boltzmann distribution. For example, an increase in temperature...

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Updated: Jul 1, 2025

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

Published on: September 17, 2021

通过机器学习的原子间潜力和途径整体分子动力学来建模温度依赖的电子热扩散散.

Dennis S Kim¹, Michael Xu¹, James M LeBeau¹

¹Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Physical review letters

|March 8, 2024

概括

此摘要是机器生成的。

机器学习潜力和量子力学准确地模拟了电子热扩散散散. 这种方法精确地捕捉了SrTiO3等材料的原子振动和晶格动态,与实验结果相匹配.

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相关实验视频

Last Updated: Jul 1, 2025

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package

Published on: September 17, 2021

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

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Published on: April 8, 2020

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科学领域:

材料科学材料科学材料科学
计算物理计算物理
固态化学固态化学

背景情况:

电子热扩散散射 (eTDS) 对原子振动和晶格动态敏感.
准确的eTDS模拟需要精确的潜在能量景观和热运动描述.
现有的方法往往难以完全捕捉晶格动态中的量子力学效应.

研究的目的:

为了证明机器学习的原子间潜力 (MLIP) 和途径整体分子动力学 (PIMD) 模拟eTDS的能力.
在纳米分辨率下评估 eTDS 对原子振动和晶格动态的灵敏度.
为了验证模拟准确性与各种温度的实验eTDS数据对比.

主要方法:

开发和应用MLIP来建模SrTiO3.3的潜在能量表面.
实施PIMD以纳入核量子效应和热运动.
使用MLIP和PIMD模拟eTDS,比较热运动的不同近似值.

主要成果:

与PIMD结合的MLIPs准确地捕捉了潜在的能源景观和格子动态.
结合核量子效应的模拟显示出与实验性eTDS的良好一致.
该研究强调了量子力学精度对于可靠的eTDS模拟的重要性.

结论:

MLIP和PIMD为模拟电子热扩散散散提供了一个强大的框架.
这种计算方法可以精确评估网格动力学和原子振动.
这些发现为使用纳米级的eTDS进行先进材料表征铺平了道路.