Treatment of excited states in the CASSCF method: Application to BO
✍ Scribed by J. Almlöf; A. V. Nemukhin; A. Heiberg
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 587 KB
- Volume
- 20
- Category
- Article
- ISSN
- 0020-7608
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✦ Synopsis
Abstract
The CASSCF method has been applied to some excited states of the BO molecule. Only portions of the full potential curves could be obtained with the help of the usual two‐step procedure. It was possible to complete the curves and to consider other excited states by using an averaged field technique. In this approach the energies were computed with orbitals that were self‐consistently determined with first‐ and second‐order density matrices averaged over several states.
📜 SIMILAR VOLUMES
Using the natural transition orbital method of Day et al., we propose a method for the calculation of excited states when the ground state is given by a correlated wave function. This method is a natural extension of the electron-hole potential method of Morokuma and Iwata to a correlated system.
## Abstract Using the complete active space self‐consistent field method with a large atomic natural orbital basis set, 10, 13, and 9 electronic states of the OClO radical, OClO^+^ cation, and OClO^−^ anion were calculated, respectively. Taking the further correlation effects into account, the seco