On the degree of Koopmans' violations in alkylfulvenes
โ Scribed by T.L. Welsher; J.M. Buschek; C.J. Nelin; F.A. Matsen
- Publisher
- Elsevier Science
- Year
- 1979
- Tongue
- English
- Weight
- 196 KB
- Volume
- 67
- Category
- Article
- ISSN
- 0009-2614
No coin nor oath required. For personal study only.
โฆ Synopsis
We report and compare the ~r-ionization potentials of the 1-alkylfulvenes and the 1-alkylhexatrienes as computed by full CI, by first order Hartree-Fock and by Koopmans' theory using PPP and Hiickel-Hubbard hamiltonians. These data provide the basis for a meaningful assessment of Koopmans' violations,
๐ SIMILAR VOLUMES
We discuss conditions under which extended Koopmans' eigenvalues become exact ionisatlon potentials. Second-order perturbation theory is used to compare with known expressions involving relaxation contributions to the exact resulls. In two-electron systems all the EK elgenvalues are shown to be exac
The nitrogen molecule is one of the simplest and best known examples wilere Koopmans'theorem not only fails in predicting accurate values for tbs. vertical ionization potentials but even yields tl,,! wrong sequence of the two lowest ionizations. In this paper a perturbation treatment we had presente
0 ... 0 1, (Q, Qi form an additive system of quantities), if [Q, P] = 0 (superselection rule), and if the reduced density matrix pi is obtained from the density matrix P by tracing out over the j-spaces, j -f i, then [qi , pi] = 0. This shows that a superselection rule for an additive quantity propa