In (restricted) open-shell Hartree-Fock theory, the ebenvalues of the effective hamiltonian do not have the &al significance as negative jonization potentials (Koopmans' theorem). By defii orbital energies in terms of certain en-. ergyexpectation values, it is possible to obtain analogues of Koopman
Sources of error in open shell Hartree-Fock calculations
β Scribed by T.E.H. Walker
- Publisher
- Elsevier Science
- Year
- 1971
- Tongue
- English
- Weight
- 392 KB
- Volume
- 9
- Category
- Article
- ISSN
- 0009-2614
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π SIMILAR VOLUMES
The theory of analytic energy gradients for the open-shell single and double excitation coupled-cluster (CCSD) method based on restricted open-shell Hartrce-Fock (ROHF) reference functions is presented. The new CCSD gradient method is applied to the dissociation of the 'A" state of formaldehyde (CH,
In this study it is demonstrated that STO Slater-type orbital basis sets are particularly well suited to pseudospectral HartreeαFock Ε½ . calculations. The reduction of two-electron integrals, to ones that are at worst equivalent to a one-electron integral over three centers, eliminates the need for
It is lown that the idea of Dacre and Eider, concerning the reduction of the two-efectron integral file by using symmetry, can be used in rel.@istic Hartree+o&--Dirac cakxhtions without reformuiation. The integral cakxafation ten remain nearly unchanged,fience~the advantages of the method are fully