In the multiplicative integral approximation (MIA), two-electron integrals are evaluated using an expansion of a product of two Gaussians in terms of auxiliary functions. An estimator of the error introduced by the approximation is incorporated in the self-consistent field (SCF) calculations and the
Ab Initio Calculations on the Tricarbon Monoxide Molecule C3O
β Scribed by M. Hochlaf
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- English
- Weight
- 161 KB
- Volume
- 210
- Category
- Article
- ISSN
- 0022-2852
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β¦ Synopsis
The six-dimensional potential energy surface of the ground state X 1 + of C 3 O has been generated by the CCSD(T) approach. The spectroscopic constants of this molecule are calculated and the vibrational spectrum is derived. The fundamentals are accurate to within 10 cm -1 compared to the available experimental data. The ground state correlates to the closed shell C 2 (X 1 + g ) + CO(X 1 + ) dissociation limit. The bonding in this molecule can be explained by charge transfer from CO to C 2 . The lowest electronic excited states are also investigated.
π SIMILAR VOLUMES
The effect of polarization functions for ab initio molecular orbital calculations at the 3-21G\* level has been studied for disiloxane. Calculated molecular geometry, dipole moment, and the linearization barrier variation were analyzed for different uncontracted polarization functions. It was conclu
## Abstract A modified integral package for evaluation of twoβelectron integrals over Gaussian basis functions is described. Modifications are implemented in the MOLECULE program system and are especially suited for the study of large molecules and molecular complexes.