A theoretical study of transition state spectroscopy: Laser dressed potential energy surface and surface hopping trajectory calculations on K+NaCl and Na+KCl

1989 ◽  
Vol 91 (12) ◽  
pp. 7477-7489 ◽  
Author(s):  
Koichi Yamashita ◽  
Keiji Morokuma
Keyword(s):  
Potential Energy ◽  
Transition State ◽  
Potential Energy Surface ◽  
Energy Surface ◽  
Theoretical Study ◽  
Surface Hopping ◽  
Trajectory Calculations ◽  
Spectroscopy Laser

Potential-energy surface-hopping algorithms for polyatomic molecules: theoretical study

1996 ◽  
Author(s):  
Boris A. Grishanin ◽  
Victor N. Zadkov ◽  
Valentin D. Vachev ◽  
John H. Frederick
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Energy Surface ◽  
Theoretical Study ◽  
Polyatomic Molecules ◽  
Surface Hopping

Active Learning Accelerates Ab Initio Molecular Dynamics on Pericyclic Reactive Energy Surfaces

2020 ◽  
Author(s):  
Shi Jun Ang ◽  
Wujie Wang ◽  
Daniel Schwalbe-Koda ◽  
Simon Axelrod ◽  
Rafael Gomez-Bombarelli
Keyword(s):  
Molecular Dynamics ◽  
Potential Energy ◽  
Transition State ◽  
Potential Energy Surface ◽  
Ab Initio ◽  
Energy Surface ◽  
Computational Cost ◽  
Reactive Trajectories ◽  
Dynamics Simulations ◽  
Energy Surfaces

<div>Modeling dynamical effects in chemical reactions, such as post-transition state bifurcation, requires <i>ab initio</i> molecular dynamics simulations due to the breakdown of simpler static models like transition state theory. However, these simulations tend to be restricted to lower-accuracy electronic structure methods and scarce sampling because of their high computational cost. Here, we report the use of statistical learning to accelerate reactive molecular dynamics simulations by combining high-throughput ab initio calculations, graph-convolution interatomic potentials and active learning. This pipeline was demonstrated on an ambimodal trispericyclic reaction involving 8,8-dicyanoheptafulvene and 6,6-dimethylfulvene. With a dataset size of approximately</div><div>31,000 M062X/def2-SVP quantum mechanical calculations, the computational cost of exploring the reactive potential energy surface was reduced by an order of magnitude. Thousands of virtually costless picosecond-long reactive trajectories suggest that post-transition state bifurcation plays a minor role for the reaction in vacuum. Furthermore, a transfer-learning strategy effectively upgraded the potential energy surface to higher</div><div>levels of theory ((SMD-)M06-2X/def2-TZVPD in vacuum and three other solvents, as well as the more accurate DLPNO-DSD-PBEP86 D3BJ/def2-TZVPD) using about 10% additional calculations for each surface. Since the larger basis set and the dynamic correlation capture intramolecular non-covalent interactions more accurately, they uncover longer lifetimes for the charge-separated intermediate on the more accurate potential energy surfaces. The character of the intermediate switches from entropic to thermodynamic upon including implicit solvation effects, with lifetimes increasing with solvent polarity. Analysis of 2,000 reactive trajectories on the chloroform PES shows a qualitative agreement with the experimentally-reported periselectivity for this reaction. This overall approach is broadly applicable and opens a door to the study of dynamical effects in larger, previously-intractable reactive systems.</div>

Theoretical study of the Cl(2P) + SiH4 reaction: Global potential energy surface and product pair-correlated distributions. Comparison with experiment.

2021 ◽  
Author(s):  
J. Espinosa-Garcia ◽  
Jose Carlos Corchado
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Energy Surface ◽  
Theoretical Study ◽  
Title Reaction ◽  
Comparison With Experiment ◽  
Explicitly Correlated ◽  
High Level ◽  
First Time ◽  
Product Pair

For the theoretical study of the title reaction, an analytical full-dimensional potential energy surface named PES-2021 was developed for the first time, by fitting high-level explicitly-correlated ab initio data. This...

Theoretical Study of the CH3NO2Unimolecular Decomposition Potential Energy Surface

2002 ◽  
Vol 106 (32) ◽  
pp. 7294-7303 ◽  
Author(s):  
Wen-Fang Hu ◽  
Tian-Jing He ◽  
Dong-Ming Chen ◽  
Fan-Chen Liu
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Energy Surface ◽  
Theoretical Study ◽  
Decomposition Potential

Theoretical study of the [Si, C, P, O] potential energy surface

2007 ◽  
Vol 105 (17-18) ◽  
pp. 2423-2432 ◽  
Author(s):  
Fei Li ◽  
Zhuo Li ◽  
Guang-Tao Yu ◽  
Xu-Ri Huang ◽  
Chia-Chung Sun
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Energy Surface ◽  
Theoretical Study

scholarly journals Theoretical study on the reaction of triallyl isocyanurate in the UV radiation cross-linking of polyethylene

RSC Advances ◽  
2017 ◽  
Vol 7 (59) ◽  
pp. 37095-37104 ◽  
Author(s):  
Hong Zhao ◽  
Junqi Chen ◽  
Hui Zhang ◽  
Yan Shang ◽  
Xuan Wang ◽  
...  
Keyword(s):  
Potential Energy ◽  
Potential Energy Surface ◽  
Uv Radiation ◽  
Theoretical Investigation ◽  
High Voltage ◽  
Energy Surface ◽  
Theoretical Study ◽  
Cross Linking ◽  
Surface Information ◽  
Reaction Potential

Herein, a theoretical investigation on the reaction potential energy surface information of triallyl isocyanurate (TAIC) in the UV radiation cross-linking process of polyethylene is conducted at the B3LYP/6-311+G(d,p) level for the production of high voltage cable insulation materials.

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