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Modification of virtual orbitals

โœ Scribed by Nelson H. F. Beebe


Publisher
John Wiley and Sons
Year
1979
Tongue
English
Weight
663 KB
Volume
15
Category
Article
ISSN
0020-7608

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โœฆ Synopsis


Abstract

The utility of modifying the virtual orbitals of the Fock operator by introducition of an additional potential is discussed. A particularly convenient form for computational implementations is obtained, and improved methods for the practical solution of the secular problem are recommended.


๐Ÿ“œ SIMILAR VOLUMES


Virtual orbitals
โœ David B. Cook ๐Ÿ“‚ Article ๐Ÿ“… 1996 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 756 KB

It is shown that the conventional concepts based on the use of the HOMO and LUMO are founded on very questionable assumptions. In particular, it is shown both theoretically and computationally that the LUMO of almost all neutral atoms and molecules is a continuum function with energy zero. The LUMO

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## Abstract The application of the MBPT in the localized representation requires that both the occupied and the virtual orbitals obtained by the canonical HF equation should be localized. The localization of the occupied orbitals is straightforward in general by any localization method. It is shown

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โœ M. Raimondi; M. Sironi; J. Gerratt; D. L. Cooper ๐Ÿ“‚ Article ๐Ÿ“… 1996 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 640 KB

The goal of obtaining accurate potential energy surfaces for the study of intermolecular forces is of fundamental importance. In this article, we propose a new method to generate a set of virtual orbitals optimized in such a way to give very compact valence bond (VB) wave functions with the same acc

A note on virtual orbitals
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A modified Fock operator, having "virtual" eigenvalues and eigenvtctors closely resemblinp one-electron excitations, is derived from a variational method for excited states. A numerical illustration on the tie atom is given. The question of the s\*called virtual orbit& in the Hartree-Fock method ha

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โœ J. Wasilewski; S. Zelek; Malgorzata Wierzbowska ๐Ÿ“‚ Article ๐Ÿ“… 1996 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 762 KB

The efficiency of modified virtual orbitals (MVO) of ionic type and of approximate orthogonalized natural orbitals (ONO) in the CI-SD calculations was studied for 0, and SO, molecules and compared with the commonly used canonical virtual orbitals (CVOs). The systems studied represent a class of elec