Abstract
We present a complex-coordinate rotation calculation of doubly excited resonance states in associated with the N=3, N=4, and N=5 Ps thresholds. Elaborate Hylleraas-type wave functions with up to N=1330 terms are used. In addition to Feshbach resonances below various Ps thresholds, we have identified shape resonances with one each lying above the N=3 and N=5 Ps thresholds, respectively, as well as a shape resonance above the N=4 threshold. A physical interpretation of the doubly excited is also given.
- Received 28 March 1994
DOI:https://doi.org/10.1103/PhysRevA.50.2155
©1994 American Physical Society