A method for excited states is givepn on the bzsis of the symmetry-adapted-cluster (SAC) expansion method. It is based on the fact that the SAC expansion method &es inci;lentally a set of excited functions which satisfies the Brillouin theorem with the ground state.
Cluster expansion of the wavefunction. Ionization potentilals of benzene
โ Scribed by K. Hirao; H. Kato
- Publisher
- Elsevier Science
- Year
- 1983
- Tongue
- English
- Weight
- 405 KB
- Volume
- 98
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
The \crtic;l md adiabatic ionization potentials of benzene are studied by the cluster expansion of the wavefunction theory. The calculation confirms the assignment of the photoelectron spectrum experimentally proposed by Jonsson and Lindholm. The nature of the Jahn-TeUcr effect in states arising from ionization of doubly degenerate z and o orbit& is 31~0 discussed.
๐ SIMILAR VOLUMES
Ionizations and some lower singlet valence and Rydberg excitations of naphthalene are studied by the SAC/SAC CI method with 100 (44 n + 56 o) active MOs. A systematic assignment of the ionization spectra is given. In particular, assignments are given for the peaks in the 13-20 eV region. A large o-e
Symmetry-adapted-cluster (SAC) calculations were performed on BH. H20. NH3, HF and CzHe\_ Resu!ts are compared with limited Cl and full CI calculations. It is shown that the cluster expansion recovers =98% of the total correlation energy and yields a very good approsimation for the cdculstion of the
We have discussed the utility of the cluster expansion of the wavefunction and proposed a pseudo+rbital theory which constitutes a generalization of the orbital-theoretic idea It has been applied to the calculation of spin densities of the fustrow atoms. The results are encouraging in comparison wit