Potential energy curves for P2 and P2+ constructed from a strictly N-representable natural orbital functional. (1st November 2016)

• Record Type: Journal Article
• Authors: Piris, M.; March, N. H.
• Is Part Of: Physics and chemistry of liquids. Volume 54:Number 6(2016)
• Page Start: 797
• Page End: 801
• Publication Date: 2016-11-01
• Subjects: Inhomogeneous electron liquids: P2 and P2+ -- NOF theory -- dissociation energies -- EKT -- ionisation energies; Liquids -- Periodicals; 530.4205
• DOI: 10.1080/00319104.2016.1166364
• Languages: English
• ISSNs: 0031-9104

Abstract

ABSTRACT: The potential energy curves of P2 and have been calculated using an approximate, albeit strictly N-representable, energy functional of the one-particle reduced density matrix: PNOF5. Quite satisfactory accord is found for the equilibrium bond lengths and dissociation energies for both species. The predicted vertical ionisation energy for P2 by means of the extended Koopmans' theorem is 10.57 eV, in good agreement with the experimental data. Comparison of the vibrational energies and anharmonicities with their corresponding experimental values supports the quality of the resultant potential energy curves.