Perturbation Theory for Quasidegenerate System in Quantum Mechanics
- 1 September 1984
- journal article
- Published by Oxford University Press (OUP) in Progress of Theoretical Physics
- Vol. 72 (3) , 534-548
- https://doi.org/10.1143/ptp.72.534
Abstract
Quantum mechanical perturbation theory is formulated for a quasidegenerate system. The equation of des Cloizeaux and Brandow, which has been a basic equation for determining the usual non-Hermitian effective interaction in the degenerate perturbation theory, is generalized to the quasidegenerate case. It is proved that the generalized equation can be solved exactly and the usual non-Hermitian effective interaction can be given in an explicit form even though unperturbed energies are not degenerate. The structure of Hermitian form is also discussed.Keywords
This publication has 2 references indexed in Scilit:
- Topics in many-body theory of nuclear effective interactionsPublished by Springer Nature ,2008
- Connections between perturbation theory and the unitary transformation methods of deriving effective HamiltoniansInternational Journal of Quantum Chemistry, 1981