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
Localization of virtual orbitals
✍ Scribed by Ferenc Bartha; Ferenc Bogár; Ede Kapuy
- Publisher
- John Wiley and Sons
- Year
- 1990
- Tongue
- English
- Weight
- 231 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0020-7608
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✦ Synopsis
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 that by using Boys' method the localized virtual orbitals are spatially well separated and transferable not only in minimal basis sets.
📜 SIMILAR VOLUMES
## 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 recommend
## Abstract A virtual orbital transformation is proposed involving pairing of localized occupied orbitals with virtual orbitals. The virtual orbitals are transformed so that each virtual orbital is as “close” as possible to its occupied counterpart, where closeness is the inverse of the particular
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