Molecular polarisabilities calculated with density functional theory using both the local density approximation and a gradient corrected functional are contrasted with results obtained using standard ab initio methods. The ab initio methods used are SCE second-order and fourth-order MΒ’ller-Plesset p
An ab initio study of VC: a comparison of different levels of theory including density functional methods
β Scribed by Robert G.A.R. Maclagan; Gustavo E. Scuseria
- Publisher
- Elsevier Science
- Year
- 1996
- Tongue
- English
- Weight
- 291 KB
- Volume
- 262
- Category
- Article
- ISSN
- 0009-2614
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β¦ Synopsis
A comparison is made of various ab initio methods, including density functional methods for the 2A and 2E states of VC. The calculations confirm that the ground state of VC is the 2A state. A 2II state is not well described by a single configuration. The bond length in the 2/% state is 1.65 ~,, the dissociation energy 2.9 eV, and the harmonic vibrational frequency is about 733 cm-1. The B3LYP predictions are good, but not as good as found for TiC and CrC.
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The activation barriers for computationally difficult radical abstraction reactions with small radicals were studied with Becke's 88 density functional theory Ε½ . DFT and G1 and G2 ab initio methods. Although many DFT methods produced negative activation barriers, Becke's 88 DFT methods generated ac