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- Benoît Braïda, Julien Toulouse, Michel Caffarel, C. J. Umrigar
- The Journal of chemical physics
- 2011

We consider the use in quantum Monte Carlo calculations of two types of valence bond wave functions based on strictly localized active orbitals, namely valence bond self-consistent-field and breathing-orbital valence bond wave functions. Complemented by a Jastrow factor, these Jastrow-valence-bond wave functions are tested by computing the equilibrium well… (More)

- Benoît Braïda, Lea Thogersen, Wei Wu, Philippe C. Hiberty
- Journal of the American Chemical Society
- 2002

The stability of O therefore O, N therefore N, S therefore S, P therefore P, and Si therefore Si three-electron bonds in anionic radicals isoelectronic to dihalogen radical anions is studied by means of ab initio calculations on model systems. The difficulty of generating the dissociation energy profiles of such anions and their rearrangement to neutral… (More)

- Benoît Braïda, Sandrine Hazebroucq, Philippe C. Hiberty
- Journal of the American Chemical Society
- 2002

The effects of methyl substitution on the geometries and bonding energies of a systematic series of three-electron-bonded radical cations of the type [H(n)X...XH(n)](+), covering all possible symmetrical three-electron bonds that may take place between atoms of the second and third rows of the periodic table, have been investigated at the level of… (More)

- Mathieu Linares, Benoît Braïda, Stéphane Humbel
- The journal of physical chemistry. A
- 2006

A method for expressing the wave function in terms of Lewis structures is proposed and tested on the allyl cation. This computational scheme is called valence bond BOND (VBB). The compact VBB wave function gives consistent results with the breathing orbital valence bond method (BOVB) for the resonance energy of the allyl cation (54 and 55 kcal/mol for VBB… (More)

- Benoît Braïda, Etienne Derat, Stéphane Humbel, Philippe C. Hiberty, Sason Shaik
- Chemphyschem : a European journal of chemical…
- 2012

- Thomas Bouabça, Benoît Braïda, Michel Caffarel
- The Journal of chemical physics
- 2010

A new type of electronic trial wavefunction suitable for quantum Monte Carlo calculations of molecular systems is presented. In contrast with the standard Jastrow-Slater form built with a unique global Jastrow term, it is proposed to introduce individual Jastrow factors attached to molecular orbitals. Such a form is expected to be more physical since it… (More)

- Mathieu Linares, Stéphane Humbel, Benoît Braïda
- The journal of physical chemistry. A
- 2008

A recent valence bond scheme based on Lewis structures, the valence bond BOND (VBB) method (BOND: Breathing Orbitals Naturally Delocalized) method (Linares, M.; Braida, B.; Humbel, S. J. Phys. Chem. A 2006, 110, 2505-2509), is applied to explore the nature of resonance in allyl systems. Whereas allyl radical is correctly described by the resonance between… (More)

- Rosa Llusar, Santiago Uriel, +5 authors Enric Canadell
- Journal of the American Chemical Society
- 2004

A trinuclear cluster complex containing the Mo(3)S(7) central unit coordinated to dithiolate ligands, in particular the organic dmit (1,3-dithia-2-thione-4,5-dithiolate) anion, has been used to prepare a single-component molecular conductor formed by the threefold symmetry magnetic building block Mo(3)S(7)(dmit)(3) (1). The [Mo(3)S(7)(dmit)(3)](2)(-)… (More)

- Benoît Braïda, Dilshaad Bundhoo, Bernd Engels, Philippe C. Hiberty
- Organic letters
- 2008

The conventional resonance model describes protonated carbonyls, imines, and thiocarbonyls by a superposition of two structures, one pi polar-covalent and the other of carbenium type. The validity of this model is clearly supported by high level valence bond calculations, giving a 32% weight for the carbenium form in protonated carbonyl, 19% in protonated… (More)

- Benoît Braïda, Etienne Derat, Patrick Chaquin
- Chemphyschem : a European journal of chemical…
- 2013

The conditions of formation of strong two-center one-electron bonds in neutral compounds are discussed. Both molecular orbital and valence bond analyses show that good candidates are adducts of radicals ˙AR3 (A=C, Si, Ge) of low ionization energy (IE) with boranes BX3 of high electron affinity (EA). This is confirmed by ab initio calculations. The bond… (More)