Comparison of the saddle-point method and the Feshbach-type projection method
- 1 November 1990
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review A
- Vol. 42 (9) , 5726-5729
- https://doi.org/10.1103/physreva.42.5726
Abstract
In this work, we compare the saddle-point method with the Feshbach-type projection-operator method using experimental and theoretical data in the literature. It appears that the saddle-point energy gives a better approximation to the resonance energy. This result is explained in terms of the variational principle of quantum mechanics. It is also pointed out that the existing Feshbach-type projection method is not suitable for general triply excited states such as (2snln’l’) where n,n’≥3.Keywords
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