Density-functional study of small molecules within the Krieger-Li-Iafrate approximation

We report density-functional studies of several small molecules (H(2), N(2), CO, H(2)O, and CH(4)) within the Krieger-Li-Iafrate (KLI) approximation to the exact Kohn-Sham local exchange potential, using a three-dimensional real-space finite-difference pseudopotential method. It is found that the exchange-only KLI approximation leads to markedly improved eigenvalue spectra compared to those obtained within the standard local-density approximation (LDA), the generalized gradient approximation (GGA), and the Hartree-Fock (HF) method. For structural properties, exchange-only KLI approximation results are close to the corresponding HF values. We find that the addition of LDA or GGA correlation energy functionals does not lead to systematic improvements. [S1050-2947(99)08111-1].
Publisher
AMER PHYSICAL SOC
Issue Date
1999-11
Language
ENG
Keywords

GENERALIZED-GRADIENT APPROXIMATION; DIFFERENCE-PSEUDOPOTENTIAL METHOD; ELECTRONIC-STRUCTURE CALCULATIONS; EXCHANGE-CORRELATION POTENTIALS; KOHN-SHAM EXCHANGE; LOCAL SPIN-DENSITY; DERIVATIVE DISCONTINUITIES; DIATOMIC-MOLECULES; ENERGY; ATOMS

Citation

PHYSICAL REVIEW A, v.60, no.5, pp.3633 - 3640

ISSN
1050-2947
DOI
10.1103/PhysRevA.60.3633
URI
http://hdl.handle.net/10203/75050
Appears in Collection
EEW-Journal Papers(저널논문)
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