Resonance energies direct variational methods

Direct Variational Methods for Complex Resonance Energies... 

Recent years have seen the development of a number of methods for direct calculation of complex resonance energies, both In the context of electron scattering from atoms and molecules and In the context of heavy-particle scattering. This article Is not Intended as a review of that literature. Rather, I present here a brief summary of some of our own work together with a description of a few other approaches with the intention of exhibiting the common theme they employ. That theme is a generalized complex variational... 

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