Journal
CHEMICAL PHYSICS LETTERS
Volume 528, Issue -, Pages 59-62Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2012.01.016
Keywords
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Funding
- DOD/ARO
- DOE/LANL [DOE-DE-AC52-06NA25396]
- Office of Science of the U.S. Department of Energy [DE-AC05-00OR22725]
- TACC
- [DMR-0804549]
- [OCI-0904794]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [804549] Funding Source: National Science Foundation
- Office of Advanced Cyberinfrastructure (OAC)
- Direct For Computer & Info Scie & Enginr [0904794] Funding Source: National Science Foundation
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We analyze the effect of increasing charge density on the fixed-node errors in diffusion Monte Carlo (FNDMC). We compare FNDMC ground state energies of 4-electron atomic systems with nuclear charge Z using Hartree-Fock and restricted Configuration Interaction trial wave functions. We perform these calculations for several different values of the nuclear charge, and we analyze the systematic trends of the recovered correlation energies as a function of Z. For this testing system we demonstrate that the fixed-node error of the Hartree-Fock trial wave functions increases linearly with increasing the nuclear charge. (C) 2012 Elsevier B.V. All rights reserved.
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