相关实验视频

Updated: Jul 9, 2025

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

Published on: April 8, 2020

改进了大气中大型分子团的配置采样协议

Haide Wu¹, Morten Engsvang¹, Yosef Knattrup¹

¹Department of Chemistry, Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark.

|December 4, 2023

概括

量子化学计算通过模拟粒子形成来帮助气溶研究. 一种新的道方法提高了大气大的准确性,揭示了二甲基胺团比氨团更稳定.

科学领域:

大气中的化学成分
计算化学是一种计算化学.
气溶科学是一门气溶科学.

背景情况:

大气粒子形成对于气溶研究至关重要.
量子化学计算模型早期的气溶形成.
对大型系统来说,平衡精度和计算成本是关键.

研究的目的:

对大气集群的基准计算方法.
改进配置采样,以便准确地搜索全球能源最小值.
研究硫酸-胺集群的低能耗配置.

主要方法:

基准评价 B97-3c 结合能量和结构的方法.
开发和评估用于配置采样的道方法.
将工作流应用于硫酸-氨和硫酸-二甲基胺集群.

主要成果:

B97-3c为大型集群提供了准确性和计算成本的平衡.
道化方法提高了在发现全球能源最小值时的准确性.
含有二甲基胺的集群比含有氨的集群具有更高的结合自由能量稳定性.

结论:

开发的方法在气溶研究中的计算和实验尺度之间建立了桥梁.
道方法改善了对大型分子的研究.
在这些集群中,二甲基是一种比氨更有效的稳定剂.

更多相关视频

Spatial Separation of Molecular Conformers and Clusters

Spatial Separation of Molecular Conformers and Clusters

Published on: January 9, 2014

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

相关概念视频

Sampling Plans

Sampling Plans

Sampling is a crucial step in analytical chemistry, allowing researchers to collect representative data from a large population. Common sampling methods include random, judgmental, systematic, stratified, and cluster sampling.
Random sampling is a method where each member of the population has an equal chance of being selected for the sample. It involves selecting individuals randomly, often using random number generators or lottery-type methods. For example, when analyzing the properties of a...

Gas Chromatography: Sample Injection Systems

Gas Chromatography: Sample Injection Systems

In gas chromatography, the sample is introduced as a vapor plug into the carrier gas stream for high efficiency and resolution. A microsyringe injects the sample solution into a heated sample port, vaporizing it and mixing it with the carrier gas. This process is important to ensure the sample is properly prepared for analysis. Thermally sensitive samples can be injected directly into the column and volatilized by slowly increasing the column temperature.
Two primary injection methods are used...