An ab initio method for calculation on many-electron molecular systems with the approximation of the inactive part of a molecule by frozen molecular fragment is presented. In the following method the SCF calculations are performed in two series. First the molecular orbitals resulting from the first
The effective fragment potential method. An approximate ab initio mo method for large molecules
β Scribed by Katsuhisa Ohta; Yasunori Yoshioka; Keiji Morokuma; Kazuo Kitaura
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 501 KB
- Volume
- 101
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
β¦ Synopsis
The effective fragment potential (ErP) approximation within the ab initio hi0 method is proposed. Only the active electrons of a molecule are explicitly taken into account. the rest of the molecule being replaced by an effective potential. Corrsldcring NH3 LIS 1 two-electron system. the potcnrial parameters have been determined and tested for various com-p1c\es.
π SIMILAR VOLUMES
Results from pseudopotential calculations on S-hydroxyindole, tryptamine, 5-hydroxytryptamine, 6-hydroxytryptamine and the imidazolium cation are compared to full ab-initio calculations. The localization of all molecular orbitals is found to be identical with the two methods. Orbital energies from t
The method of approximation of the frozen molecular fragment (FMF) we derived has been applied to calculations of proton affinities. Results are in good agreement with experimental data and extended basis set calculations.
A two-component Kramers' restricted Hartree-Fock method (KRHF') has been developed for the polyatomic molecules with closed shell configurations. The present KRHF program utilizes the relativistic effective core potentials with spin-orbit operators at the Hartree-Fock (HF') level and produces molecu