Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 121, Issue 24, Pages 12151-12157Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1824877
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Accurate reference wave functions and their densities have been used to obtain accurate exchange-correlation potentials for the beryllium isoelectronic sequence Be, Ne+6, Ar+14, and Kr+32. The exchange-correlation potentials for the four-electron cations with high Z in this sequence exhibit structure prior to the intershell peak that is not present in neutral atoms. The kinetic energy contribution to the exchange-correlation potential contributes to the early structure as well as to the intershell peak. The near degeneracy in this four-electron sequence plays a significant role in the structure prior to the intershell peak. Several of the quantities on which the Perdew-Burke-Ernzerhoff and Tao-Perdew-Staroverov-Scuseria functionals are dependent are examined. The generalized gradient approximations appear not to account for the near degeneracy in this series. (C) 2004 American Institute of Physics.
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