An ab initio determination of 1A1-3B1 energy gap in CH2 using orthogonally spin-adapted state-universal and state-specific coupled-cluster methods

1994 ◽  
Vol 230 (4-5) ◽  
pp. 377-386 ◽  
Author(s):  
Piotr Piecuch ◽  
Xiangzhu Li ◽  
Josef Paldus
Keyword(s):  
Ab Initio ◽  
Energy Gap ◽  
Coupled Cluster ◽  
Coupled Cluster Methods ◽  
Cluster Methods

scholarly journals NMR parameters of FNNF as a test for coupled-cluster methods: CCSDT shielding and CC3 spin–spin coupling

2020 ◽  
Vol 22 (37) ◽  
pp. 21350-21359
Author(s):  
Michał Jaszuński ◽  
Stephan P. A. Sauer ◽  
Rasmus Faber ◽  
David J. D. Wilson
Keyword(s):  
Ab Initio ◽  
Coupling Constants ◽  
Spin Coupling ◽  
Coupled Cluster ◽  
Nmr Parameters ◽  
Coupled Cluster Methods ◽  
Quantitative Accuracy ◽  
Spin Coupling Constants ◽  
Spin Spin Coupling ◽  
Cluster Methods

NMR shielding and spin–spin coupling constants of cis and trans isomers of FNNF have been determined to near-quantitative accuracy from ab initio calculations.

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)].

Active-space coupled-cluster methods

2010 ◽  
Vol 108 (21-23) ◽  
pp. 2987-3015 ◽  
Author(s):  
Piotr Piecuch
Keyword(s):  
Coupled Cluster ◽  
Active Space ◽  
Coupled Cluster Methods ◽  
Cluster Methods
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