使用MASH模拟由形交叉点诱导的电子连贯性:应用到阿托秒X射线光谱的应用.
Daniele Furlanetto1, Jeremy O Richardson1
1Department of Chemistry and Applied Biosciences, ETH Zürich, 8093 Zürich, Switzerland.
The journal of physical chemistry letters
|June 25, 2025
概括
表面跳跃的映射方法 (MASH) 准确地捕捉了非adiabatic动态中的电子连贯性,优于标准的表面跳跃模拟. 这种方法非常适合高级X射线光谱仪,如TRUECARS.
科学领域:
- 量子化学是一种量子化学.
- 计算化学是一种计算化学.
- 频谱学是一种光谱学.
背景情况:
- 在形交叉点附近的非交互动力学对于理解化学反应至关重要.
- 准确预测电子连贯性对于解释光谱数据至关重要.
- 标准的表面跳跃方法有时很难准确地描述这些连贯性.
研究的目的:
- 为了比较Mapping Approach to Surface Hopping (MASH) 与标准的最少开关的表面跳跃.
- 评估MASH在预测电子连贯性和核动态方面的准确性.
- 评估MASH适用于模拟新型X射线光谱的适用性.
主要方法:
- 使用了基于轨迹的模拟.
- 将MASH方法与标准的最少开关表面跳跃进行了比较.
- 为了验证,使用了三种具有完整量子力学结果的模型系统.
主要成果:
- MASH准确地捕获了电子连贯性,而标准的表面跳跃无法描述这些连贯性.
- 这两种方法都显示了可比的计算成本.
- 还计算了核密度,以评估方法的稳定性.
结论:
- MASH是一种强大的,准确的方法来模拟非adiabatic动态,特别是电子连贯.
- 在捕捉量子效应方面,MASH比标准的表面跳跃具有显著的优势.
- 在先进的光谱学中,MASH显示出有前途的应用,例如在attosecond拉曼信号 (TRUECARS) 中超快电子连贯的短暂再分配.
相关概念视频
¹H NMR: Interpreting Distorted and Overlapping Signals
1.1K
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...
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...
1.1K
Atomic Emission Spectroscopy: Interference
285
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
285
Electron Microscope Tomography and Single-particle Reconstruction
2.6K
Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
Electron Tomography
Electron tomography can be performed either in TEM or STEM (scanning transmission...
2.6K
2D NMR: Homonuclear Correlation Spectroscopy (COSY)
1.4K
Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
1.4K
Atomic Absorption Spectroscopy: Interference
1.1K
Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
1.1K
Hybridization of Atomic Orbitals II
33.9K
sp3d and sp3d 2 Hybridization
33.9K


