Item


Correlation energy, correlated electron density, and exchange-correlation potential in some spherically confined atoms

We report correlation energies, electron densities, and exchange-correlation potentials obtained from configuration interaction and density functional calculations on spherically confined He, Be, Be2+, and Ne atoms. The variation of the correlation energy with the confinement radius Rc is relatively small for the He, Be2+, and Ne systems. Curiously, the Lee–Yang–Parr (LYP) functional works well for weak confinements but fails completely for small Rc. However, in the neutral beryllium atom the CI correlation energy increases markedly with decreasing Rc. This effect is less pronounced at the density-functional theory level. The LYP functional performs very well for the unconfined Be atom, but fails badly for small Rc. The standard exchange-correlation potentials exhibit significant deviation from the “exact” potential obtained by inversion of Kohn–Sham equation. The LYP correlation potential behaves erratically at strong confinements

Contract grant number: CTQ2014-54306-P

info:eu-repo/grantAgreement/MINECO//CTQ2014-54306-P/ES/ESTUDIOS TEORICO-EXPERIMENTALES DE CICLACIONES CATALIZADAS POR METALES DE TRANSICION. NUEVOS DESARROLLOS EN AROMATICIDAD, FUNCIONALES DE LA DENSIDAD Y QUIMICA SUPRAMOLECULAR/

Wiley

Manager: Ministerio de Economía y Competitividad (Espanya)
Author: Vyboishchikov, Sergei F.
Abstract: We report correlation energies, electron densities, and exchange-correlation potentials obtained from configuration interaction and density functional calculations on spherically confined He, Be, Be2+, and Ne atoms. The variation of the correlation energy with the confinement radius Rc is relatively small for the He, Be2+, and Ne systems. Curiously, the Lee–Yang–Parr (LYP) functional works well for weak confinements but fails completely for small Rc. However, in the neutral beryllium atom the CI correlation energy increases markedly with decreasing Rc. This effect is less pronounced at the density-functional theory level. The LYP functional performs very well for the unconfined Be atom, but fails badly for small Rc. The standard exchange-correlation potentials exhibit significant deviation from the “exact” potential obtained by inversion of Kohn–Sham equation. The LYP correlation potential behaves erratically at strong confinements
Contract grant number: CTQ2014-54306-P
Format: application/pdf
Document access: http://hdl.handle.net/10256/13706
Language: eng
Publisher: Wiley
Collection: info:eu-repo/semantics/altIdentifier/doi/10.1002/jcc.24493
info:eu-repo/semantics/altIdentifier/issn/0192-8651
info:eu-repo/semantics/altIdentifier/eissn/1096-987X
Is part of: info:eu-repo/grantAgreement/MINECO//CTQ2014-54306-P/ES/ESTUDIOS TEORICO-EXPERIMENTALES DE CICLACIONES CATALIZADAS POR METALES DE TRANSICION. NUEVOS DESARROLLOS EN AROMATICIDAD, FUNCIONALES DE LA DENSIDAD Y QUIMICA SUPRAMOLECULAR/
Rights: Tots els drets reservats
Subject: Àtoms
Atoms
Energia
Force and energy
Funcional de densitat, Teoria del
Density functionals
Electrons -- Distribució
Electron distribution
Title: Correlation energy, correlated electron density, and exchange-correlation potential in some spherically confined atoms
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

Subjects

Authors