Total energy assessment of the quality of localized basis sets:O2molecule
- 15 May 1983
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 27 (10), 6509-6511
- https://doi.org/10.1103/physrevb.27.6509
Abstract
The quality of localized basis sets in molecular calculations is assessed using the total energy as a measure of variational freedom. Basis sets which also include a set of on-site functions obtained from positive ions are found to be far better variationally than those which include virtual (unoccupied) atomic levels: In particular, the inclusion of higher virtual states in the standard LCAO (linear combination of atomic orbitals) basis does not prove convergence. These efficient and accurate basis set results for are in very good agreement with previously published full-potential linearized—augmented—plane-wave results and LCAO results using off-site functions.
Keywords
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