Variational Form of Van Vleck Degenerate Perturbation Theory with Particular Application to Electronic Structure Problems
- 1 November 1968
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 49 (9) , 3890-3894
- https://doi.org/10.1063/1.1670695
Abstract
The variational equivalent of Van Vleck degenerate perturbation theory is derived. As an example we treat the Stark effect for the 2s and 2p states of a hydrogenic atom. Other applications involving angular momentum degeneracy as well as electronic and nuclear permutation degeneracy are discussed. The existence of interchange theorems is also noted.Keywords
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