TITLE

Ab initio density functional theory: OEP-MBPT(2). A new orbital-dependent correlation functional

AUTHOR(S)
Grabowski, Ireneusz; Hirata, So; Ivanov, Stanislav; Bartlett, Rodney J.
PUB. DATE
March 2002
SOURCE
Journal of Chemical Physics;3/15/2002, Vol. 116 Issue 11, p4415
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Using the optimized effective potential (OEP) method in conjunction with an orbital-dependent correlation functional developed on the basis of second-order many-body perturbation theory [MBPT(2)], we perform ab initio correlated density functional calculations. Unlike other density functional methods, this offers the first correlation approximation in a converging series of approximations analogous to that in wave function theory. The OEP-MBPT(2) correlation potentials of the helium isoelectronic series and the neon atom are in excellent agreement with prior quantum Monte Carlo (QMC) results, while the widely used conventional approximate density functional theory correlation potentials have qualitatively incorrect behavior. Furthermore, the correlation energies, total energies, and the highest occupied orbital energies calculated by the OEP-MBPT(2) method are also remarkably accurate. Unlike QMC, our procedure can be applied to general molecules. © 2002 American Institute of Physics.
ACCESSION #
6289120

 

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