Direct coupled cluster calculations on excited states
β Scribed by Ludwik Adamowicz; Rodney J. Bartlett
- Publisher
- John Wiley and Sons
- Year
- 2009
- Tongue
- English
- Weight
- 215 KB
- Volume
- 28
- Category
- Article
- ISSN
- 0020-7608
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π SIMILAR VOLUMES
The rotational spectrum of DC 5 N has been investigated in the millimeter-wave region for 16 vibrationally excited states which approximately lie below 760 cm K1 , namely (v 6 v 7 v 8 v 9 v 10 v 11 )Z( 000001), ( 000002), ( 000003), ( 000005), ( 000010), ( 000020), (000100) (001000), ( 010000), ( 10
An open-shell coupled-cluster method for the direct calculation of excitation energies is presented. As a first test, applications to atomic Be and Ne are carried out, with exact inclusion of T, and T2 operators and lowest-order inclusion of T3. Quasicomplete model spaces are used. Two ionization p
The form&m recently developed by Poplc and co-workers for restricted Ilartree-Fock calculattons on high spin ogcn sliells is extended to ;1 general trcatmcnt of singly cxclted states. The limrtations of the method and possible alternativr approachcs are briefly discussed.
## Abstract A practical scheme for the calculation of excited states of the same symmetry as a given reference state is outlined in the context of the HartreeβFock method. In order to prevent the excited state from βcollapsingβ into a lowerβlying state, the prediagonalized Fock matrix is diagonaliz