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¹H NMR: Interpreting Distorted and Overlapping Signals

¹H NMR: Interpreting Distorted and Overlapping Signals

Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...

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Updated: Jun 27, 2025

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

稀疏-随机碎片化交换用于大规模的混合时间依赖密度功能理论计算.

Mykola Sereda¹, Tucker Allen¹, Nadine C Bradbury¹

¹Department of Chemistry and Biochemistry, and California Nanoscience Institute, UCLA, Los Angeles, California 90095-1569, United States.

Journal of chemical theory and computation

|May 7, 2024

概括

此摘要是机器生成的。

我们开发了一种新的计算方法,使用混合密度函数理论 (DFT) 准确计算大分子的光学光谱. 这种方法有效地处理数千个电子,使复杂系统能够准确地预测吸收光谱.

更多相关视频

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

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

Published on: May 27, 2020

相关实验视频

Last Updated: Jun 27, 2025

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

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

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

Published on: May 27, 2020

科学领域:

计算化学计算化学
量子化学是一个量子化学.
材料科学材料科学材料科学

背景情况:

精确计算光学光谱对于理解分子性质和设计新材料至关重要.
对于大型系统而言,现有的方法在计算上昂贵,限制了它们的适用性.
混合密度函数理论 (DFT) 提供了准确性和成本的良好平衡,但在大型系统尺寸方面存在困难.

研究的目的:

开发和介绍一种有效的计算方法来计算大型分子系统的吸收光谱.
将稀疏-随机碎片式交换形式主义扩展到线性响应时间依赖的一般化科恩-沙姆 DFT (LR-GKS-TDDFT).
为了使数千个价值电子的系统能够进行准确的光学光谱计算.

主要方法:

开发了一种稀疏-随机的碎片化交换形式主义,用于地面状态近隙混合动力 DFT.
在LR-GKS-TDDFT中应用了这种形式主义,使用基于网格/平面波的表示.
使用远程显式交换函数实现了交换内核的混合确定性/碎片化-随机压缩.
利用实时传播和频率解析的卡西达方程类型方法来计算光谱.

主要成果:

成功计算了包括分子染料在内的大型分子系统的精确光学光谱.
证明了交换内核混合确定性/碎片化-随机压缩的效率.
该方法有效地处理数千个价值电子的系统.

结论:

开发的稀疏-随机碎片化交换形式主义为大系统中计算光学光谱提供了高效和准确的方法.
这一进步扩大了DFT研究复杂分子材料的能力.
该方法适用于各种系统,特别是大型分子染料,为未来计算光谱学研究铺平了道路.