Abstract
The isolated resonance picture (IRP) is tested by comparing calculations on doubly excited autoionizing states of by using two different theoretical approaches: a recent implementation of the exterior complex scaling method and the standard Feshbach method with -spline basis sets. These calculations demonstrate that the IRP can yield poor approximations to autoionization widths when doubly excited states approach the ionization threshold at large internuclear distances, . In contrast, at small where avoided crossings appear, the IRP produces accurate resonance parameters.
- Received 13 October 2005
DOI:https://doi.org/10.1103/PhysRevA.73.014702
©2006 American Physical Society
