Covalent Excited States of Polyenes C2nH2n+2(n= 2−8) and Polyenyl Radicals C2n-1H2n+1(n= 2−8): An Ab Initio Valence Bond Study

2008 ◽  
Vol 4 (12) ◽  
pp. 2101-2107 ◽  
Author(s):  
Junjing Gu ◽  
Yonghui Lin ◽  
Ben Ma ◽  
Wei Wu ◽  
Sason Shaik
Keyword(s):  
Ab Initio ◽  
Excited States ◽  
Valence Bond

The orthogonal valence bond interpretation of ab initio chemisorption cluster model wavefunctions

1993 ◽  
Vol 177 (1) ◽  
pp. 61-67 ◽  
Author(s):  
A. Clotet ◽  
J.M. Ricart ◽  
J. Rubio ◽  
F. Illas
Keyword(s):  
Ab Initio ◽  
Cluster Model ◽  
Valence Bond

Polaronic and Bipolaronic Enhancement of Second Hyperpolarizabilities in Dithienyl Polyenes from Ab Initio Quantum Methods

1999 ◽  
Vol 597 ◽  
Author(s):  
Steven Trohalaki ◽  
Robert J. Zellmer ◽  
Ruth Pachter
Keyword(s):  
Ab Initio ◽  
Density Functional ◽  
Valence Bond ◽  
Closed Shell ◽  
Functional Theory ◽  
Molecular Conformations ◽  
Hartree Fock ◽  
Molecular Charge ◽  
Field Methodology ◽  
Moller Plesset

AbstractSpangler and He [1,2] have shown that dithienyl polyenes form extremely stable bipolaronic dications when oxidatively doped in solution. Previous theoretical studies applied empirical methods to predict bipolaronic enhancement of hyperpolarizabilities for simple polyenes [3,4]. Here, we employ density functional theory to optimize the gas-phase molecular conformations of neutral, cationic, and dicationic forms of a series of dithienyl polyenes, where the number of ethene units, N, is varied from 1–5. Ab initio Hartree-Fock, generalized valence bond, configuration interaction, and Møller-Plesset calculations demonstrate that the dications are farily well described with a closed shell and therefore have little biradicaloid character. Second hyperpolarizabilities, γ, are subsequently calculated using ab initio Hartree-Fock theory and a finite field methodology. As expected, γ increases with the number of ethene units for a given molecular charge. The cations also show the largest increase in γ with N. For a given value of N, the cations display the largest γ values. However, if we treat the dication as a triplet, which might be present in solution, then it displays the largest γ.

Ab initio calculations on the ground and excited states of InI

2003 ◽  
Vol 101 (19) ◽  
pp. 2963-2968 ◽  
Author(s):  
WENLI ZOU ◽  
MEIRONG LIN ◽  
XINZHENG YANG ◽  
BAOZHENG ZHANG
Keyword(s):  
Ab Initio Calculations ◽  
Ab Initio ◽  
Excited States

An ab initio study of the ground and low-lying excited states of KBe with the effect of inner-shell electrons

2013 ◽  
Vol 139 (7) ◽  
pp. 074305 ◽  
Author(s):  
Ke-La Xiao ◽  
Chuan-Lu Yang ◽  
Mei-Shan Wang ◽  
Xiao-Guang Ma ◽  
Wen-Wang Liu
Keyword(s):  
Ab Initio ◽  
Excited States ◽  
Ab Initio Study

Ab initio calculation of the ground and first excited states of the lithium dimer

2021 ◽  
Author(s):  
Jianjun Qi ◽  
Yuyao Bai ◽  
Qianqian Guo ◽  
Yong-Chang Han ◽  
Shundalau Maksim
Keyword(s):  
Ab Initio ◽  
Excited States ◽  
Ab Initio Calculation ◽  
Lithium Dimer

Ab Initio valence bond treatment of simple molecules

2009 ◽  
Vol 8 (S8) ◽  
pp. 285-291 ◽  
Author(s):  
M. Raimondi ◽  
G. F. Tantardini ◽  
M. Simonetta
Keyword(s):  
Ab Initio ◽  
Valence Bond ◽  
Simple Molecules
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