Second-order quasi-degenerate perturbation theory with quasi-complete active space self-consistent field reference functions

2001 ◽  
Vol 114 (3) ◽  
pp. 1133-1141 ◽  
Author(s):  
Haruyuki Nakano ◽  
Junji Nakatani ◽  
Kimihiko Hirao
Keyword(s):  
Perturbation Theory ◽  
Second Order ◽  
Complete Active Space ◽  
Active Space ◽  
Consistent Field ◽  
Self Consistent ◽  
Self Consistent Field ◽  
Degenerate Perturbation Theory ◽  
Reference Functions

Photodynamic behavior of electronic coupling in a N-methylformamide dimer

2015 ◽  
Vol 17 (18) ◽  
pp. 12356-12364
Author(s):  
Martina Zámečníková ◽  
Dana Nachtigallová
Keyword(s):  
Perturbation Theory ◽  
Excited State ◽  
Electronic Coupling ◽  
Water Molecules ◽  
Complete Active Space ◽  
Active Space ◽  
Consistent Field ◽  
Self Consistent ◽  
Self Consistent Field

The role of the bridging water molecules has been studied during the excited state photodynamics of a N-methylformamide dimer in complex with water molecules employing the complete active space self-consistent field (CASSCF) and CAS perturbation theory (CASPT2) methods.

Electronic Structure Underlying Colour Differences Between Diarylmethane Dyes and their Azomethine Analogues

2012 ◽  
Vol 65 (5) ◽  
pp. 520 ◽  
Author(s):  
Seth Olsen
Keyword(s):  
Perturbation Theory ◽  
Electronic Structure ◽  
Field Model ◽  
The State ◽  
Orbital State ◽  
Complete Active Space ◽  
Active Space ◽  
Consistent Field ◽  
Self Consistent ◽  
Self Consistent Field

We show that multireference perturbation theory based on a four-electron, three-orbital state-averaged complete active space self-consistent field model can reproduce the shift in colour between diarylmethane dyes and their corresponding azomethine analogues. We relate the azomethine shift to changes in the electronic structure, through an examination of the relative changes in the state-averaged one-electron Hamiltonian (Fock) and surprisal matrices that characterise the analogous self-consistent field solutions.

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