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Diagrammatic perturbation theory: the contribution of triply-excited states to correlation energies
| Content Provider | Scilit |
|---|---|
| Author | Wilson, S. Saunders, V. R. |
| Copyright Year | 1979 |
| Description | Journal: Journal of Physics B: Atomic and Molecular Physics The energy terms involving triply excited intermediate states that arise in fourth-order in the diagrammatic many-body perturbation series for the electron correlation energy in closed-shell systems are discussed. These terms are evaluated for the neon atom using three different Slater exponential basis sets which have been employed in previous perturbation studies and limited configuration-interaction calculations. The contribution from fourth-order terms involving quadruply excited intermediate states are also presented. It is found that in fourth-order the linked-diagram triple-excitation energy is of the same order of magnitude as the unlinked-diagram quadrupole-excitation energy. |
| Related Links | http://iopscience.iop.org/article/10.1088/0022-3700/12/14/001/pdf |
| Ending Page | L408 |
| Page Count | 6 |
| Starting Page | L403 |
| ISSN | 00223700 |
| DOI | 10.1088/0022-3700/12/14/001 |
| Journal | Journal of Physics B: Atomic and Molecular Physics |
| Issue Number | 14 |
| Volume Number | 12 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 1979-07-28 |
| Access Restriction | Open |
| Subject Keyword | Journal: Journal of Physics B: Atomic and Molecular Physics Atomic, Molecular and Chemical Physics Perturbation Theory Correlation Energy Excitation Energy Excited Intermediate Intermediate States |
| Content Type | Text |
| Resource Type | Article |
| Subject | Atomic and Molecular Physics, and Optics |
