Group theoretic methods are presented for the transformations of integrals and the evaluation of matrix elements encountered in multiconfigurational self-consistent field (MCSCF) and configuration interaction (CI) calculations. The method has the advantages of needing only to deal with a symmetry un
✦ LIBER ✦
Comparison of the boys and Pipek–Mezey localizations in the local correlation approach and automatic virtual basis selection
✍ Scribed by James W. Boughton; Peter Pulay
- Publisher
- John Wiley and Sons
- Year
- 1993
- Tongue
- English
- Weight
- 491 KB
- Volume
- 14
- Category
- Article
- ISSN
- 0192-8651
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✦ Synopsis
Abstract
Our implementation of Pipek–Mezey population localization is described. It is compared with other localization schemes and its use in the framework of the local correlation method is discussed. For such use, this localization is shown to be clearly superior to Boys in the case of physically well‐localized systems. Our current algorithm for selection of local virtual spaces is also described. © 1993 John Wiley & Sons, Inc.
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