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Quantum Monte Carlo with Jastrow-valence-bond wave functions

Cornell Affiliated Author(s)

Author

Benoît Braïda
Julien Toulouse
Michel Caffarel
C. Umrigar

Abstract

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 depths of the four diatomic molecules C2, N2, O2, and F 2 in both variational Monte Carlo and diffusion Monte Carlo. We show that it is possible to design compact wave functions based on chemical grounds that are capable of describing both static and dynamic electron correlations. These wave functions can be systematically improved by inclusion of valence bond structures corresponding to additional bonding patterns. © 2011 American Institute of Physics.

Date Published

Journal

Journal of Chemical Physics

Volume

134

Issue

8

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-79952075214&doi=10.1063%2f1.3555821&partnerID=40&md5=203e79d666b47d2401f3cba69956d692

DOI

10.1063/1.3555821

Group (Lab)

Cyrus Umrigar Group

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