Is It Possible To Obtain Coupled Cluster Quality Energies at near Density Functional Theory Cost? Domain-Based Local Pair Natural Orbital Coupled Cluster vs Modern Density Functional Theory

2015 ◽  
Vol 11 (9) ◽  
pp. 4054-4063 ◽  
Author(s):  
Dimitrios G. Liakos ◽  
Frank Neese
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Coupled Cluster ◽  
Natural Orbital ◽  
Functional Theory ◽  
Local Pair ◽  
Cluster Quality

Electronic and spin structures of CaMn4Ox clusters in the S0 state of the oxygen evolving complex of photosystem II. Domain-based local pair natural orbital (DLPNO) coupled-cluster (CC) calculations using optimized geometries and natural orbitals (UNO) by hybrid density functional theory (HDFT) calculations

2020 ◽  
Vol 22 (46) ◽  
pp. 27191-27205
Author(s):  
K. Miyagawa ◽  
S. Yamanaka ◽  
H. Isobe ◽  
M. Shoji ◽  
T. Kawakami ◽  
...  
Keyword(s):  
Photosystem Ii ◽  
Density Functional ◽  
Coupled Cluster ◽  
Oxygen Evolving Complex ◽  
Natural Orbital ◽  
Functional Theory ◽  
Local Pair ◽  
Oxygen Evolving ◽  
Hybrid Density Functional ◽  
Optimized Geometries

Domain-based local pair natural orbital coupled cluster single and double with triple perturbation correction methods were performed to elucidate the stabilities of 10 intermediate structures of the CaMn4Ox cluster of the oxygen evolving complex of photosystem II.

scholarly journals A computational study for the reaction mechanism of metal-free cyanomethylation of aryl alkynoates with acetonitrile

RSC Advances ◽  
2021 ◽  
Vol 11 (30) ◽  
pp. 18246-18251
Author(s):  
Selçuk Eşsiz
Keyword(s):  
Density Functional Theory ◽  
Reaction Mechanism ◽  
Density Functional ◽  
Computational Study ◽  
Coupled Cluster ◽  
Functional Theory ◽  
Metal Free ◽  
Coupled Cluster Methods ◽  
High Level ◽  
Cluster Methods

A computational study of metal-free cyanomethylation and cyclization of aryl alkynoates with acetonitrile is carried out employing density functional theory and high-level coupled-cluster methods, such as [CCSD(T)].

scholarly journals The ANI-1ccx and ANI-1x Data Sets, Coupled-Cluster and Density Functional Theory Properties for Molecules

2020 ◽  
Author(s):  
Justin S. Smith ◽  
Roman Zubatyuk ◽  
Benjamin T. Nebgen ◽  
Nicholas Lubbers ◽  
Kipton Barros ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Potential Energy Surfaces ◽  
Density Functional ◽  
Atomic Charge ◽  
Density Functional Theory Calculations ◽  
Coupled Cluster ◽  
Data Sets ◽  
Data Set ◽  
Functional Theory ◽  
Energy Surfaces

<p>Maximum diversification of data is a central theme in building generalized and accurate machine learning (ML) models. In chemistry, ML has been used to develop models for predicting molecular properties, for example quantum mechanics (QM) calculated potential energy surfaces and atomic charge models. The ANI-1x and ANI-1ccx ML-based eneral-purpose potentials for organic molecules were developed through active learning; an automated data diversification process. Here, we describe the ANI-1x and ANI-1ccx data sets. To demonstrate data set diversity, we visualize them with a dimensionality reduction scheme, and contrast against existing data sets. The ANI-1x data set contains multiple QM properties from 5M density functional theory calculations, while the ANI-1ccx data set contains 500k data points obtained with an accurate CCSD(T)/CBS extrapolation. Approximately 14 million CPU core-hours were expended to generate this data. Multiple QM properties from density functional theory and coupled cluster are provided: energies, atomic forces, multipole moments, atomic charges, and more. We provide this data to the community to aid research and development of ML models for chemistry.</p>

scholarly journals The ANI-1ccx and ANI-1x data sets, coupled-cluster and density functional theory properties for molecules

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Justin S. Smith ◽  
Roman Zubatyuk ◽  
Benjamin Nebgen ◽  
Nicholas Lubbers ◽  
Kipton Barros ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Coupled Cluster ◽  
Data Sets ◽  
Functional Theory

Coupled-cluster and density functional theory studies of the electronic 0–0 transitions of the DNA bases

2014 ◽  
Vol 16 (15) ◽  
pp. 6931-6941 ◽  
Author(s):  
Vasily A. Ovchinnikov ◽  
Dage Sundholm
Keyword(s):  
Density Functional Theory ◽  
Linear Response ◽  
Density Functional ◽  
Electronic Excitation ◽  
Dna Bases ◽  
Coupled Cluster ◽  
Excitation Spectra ◽  
Functional Theory

The 0–0 transitions of the electronic excitation spectra of the lowest tautomers of the four nucleotide (DNA) bases have been studied using linear-response approximate coupled-cluster singles and doubles (CC2) calculations.

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