Perturbation-iteration methods for large perturbations in quantum mechanics
- 1 January 1982
- journal article
- Published by EDP Sciences in Journal de Physique Lettres
- Vol. 43 (13) , 461-469
- https://doi.org/10.1051/jphyslet:019820043013046100
Abstract
The introduction of a reduced wave operator X allows us to present in a systematic and transparent way the usual Rayleigh-Schrödinger method. Beyond this scheme and for large perturbations, X is determined by new iterative methods which converge linearly, quadratically or quasi-quadratically. The study of a two-state system exhibits the main characteristics of these methods. The new possibilities afforded by these methods are illustrated by determining the spectrum of the neutral states of a molecule in presence of ionic intruder statesKeywords
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