The Franck–Condon and Dushinsky effects in the lowest energy 12B3u doublet of the tetracyanoquinodimethane (TCNQ) monoanion: the absorption and resonance Raman studies in terms of the density functional theory (DFT) and complete active space self-consistent field (CASSCF) methods

2004 ◽  
Vol 388 (4-6) ◽  
pp. 367-373 ◽  
Author(s):  
Marcin Makowski ◽  
Marek T Pawlikowski
Keyword(s):  
Density Functional Theory ◽  
Density Functional ◽  
Functional Theory ◽  
Complete Active Space ◽  
Active Space ◽  
Consistent Field ◽  
The Density Functional Theory ◽  
Self Consistent ◽  
Self Consistent Field ◽  
Franck Condon

scholarly journals A multiconfigurational approach to the electronic structure of trichromium extended metal atom chains

2017 ◽  
Vol 46 (19) ◽  
pp. 6202-6211 ◽  
Author(s):  
M. Spivak ◽  
V. Arcisauskaite ◽  
X. López ◽  
J. E. McGrady ◽  
C. de Graaf
Keyword(s):  
Density Functional Theory ◽  
Electronic Structure ◽  
Metal Atom ◽  
Density Functional ◽  
Functional Theory ◽  
Complete Active Space ◽  
Consistent Field ◽  
Self Consistent ◽  
Self Consistent Field ◽  
Capping Ligands

Density functional theory, Complete Active Space Self-Consistent Field (CASSCF) and perturbation theory (CASPT2) methodologies have been used to explore the electronic structure of a series of trichromium Extended Metal Atom Chains (EMACS) with different capping ligands.

scholarly journals Electronic Structure of Cubane-Like Vanadium–Nitrogen Cationic Clusters [V4N4]+ and [V6N6]+

Inorganics ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 52
Author(s):  
He ◽  
Zhang ◽  
McGrady
Keyword(s):  
Density Functional Theory ◽  
Electronic Structure ◽  
Density Functional ◽  
Mass Spectrometric ◽  
Bond Orders ◽  
Functional Theory ◽  
Complete Active Space ◽  
Consistent Field ◽  
Self Consistent ◽  
Self Consistent Field

Density Functional Theory and Complete Active Space Self-Consistent Field (CASSCF) methodologies are used to explore the electronic structure of the cationic V–N clusters, [V4N4]+ and [V6N6]+, that have been identified in recent mass spectrometric experiments. Our calculations indicate that both clusters are based on cubane-like fragments of the rock-salt lattice. In the smaller [V4N4]+ cluster, the V–V bonding is delocalized over the tetrahedron, with net bond orders of 1/3 per V–V bond. In [V6N6]+, in contrast, the V–V bonding is strongly localized in the central V2N2 unit, which has a short V=V double bond. CASSCF calculations reveal that both localized and delocalized V–V bonds are highly multi-configurational.

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