Ab initio model potential calculations on X-, X, and X+ (X = F, Cl, Br, and I) using CISD wavefunctions have been performed in order to test a recent conclusion on the irrelevance of the valence orbital internal nodes in the values of atomic valence correlation energies. The results show that the ab
Correlation energies from pseudo-potential calculations
β Scribed by B. Pittel; W.H.E. Schwarz
- Publisher
- Elsevier Science
- Year
- 1977
- Tongue
- English
- Weight
- 314 KB
- Volume
- 46
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
I l Introduction
In pseudo-potential theory [1,2], the valence electrons only are explicitely treated quantum mechanically; the influence of the core electrons is simulated by a nonlocal pseudo-potential. The following molecular electronic pseudo-hamiltonian is then used:
π SIMILAR VOLUMES
Total valence correlation energies of first-row atoms, their anions and cations as well as their homonuclear dimers have been determined in all-electron and [He]-core pseudopotential calculations using the coupled-cluster method and large uncontracted basis sets containing up to g-type functions. Th
somewhat semi-empirical pseudo-potcnlial prwcliurc of tlcnling wilh the clcctron-corrckltion problem is presentccl. It consists of the introtluction ol n corrclntiun factor in coulombic bielectronic integrals. Influcncc of kinetic rncrgy upon lhc corrclalion f;~ctor is t:lkcn into ;~ccount. providin
A series of high-level wmWed calculations of the potential energy surface for stretching vibrations of the FHF-ion has been carried out. The vibrational levels have been calculated by using the adiabatic appmch to the separation of low-(vl ) and higbfrequency (v~) modes and a flexible analytic repre
The use of atomic pseudo-potentials in ckcutaiions of atomic inmractions is briefly discussed. It is shove that an appropriate choice of pseudo-po~n~ial leads to the appearance of the van der W&s interactions in first order. Care is needed in the choice otentiat lest spurious long-range forces appea
We present potential energy surfaces for Rh-CO obtained from density functional theory for two electronic states of Rh-CO. We have performed local spin-density calculations including relativistic as well as gradient corrections. The construction of a reasonably accurate atom-atom potential for Rh-CO