https://doi.org/10.1140/epjd/e2008-00140-1
Complex-scaling treatment for high-lying doubly excited resonances for screened Coulomb helium atom
Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box
23-166, Taipei, Taiwan 106, P.R. China
Corresponding author: a sumanachin@gmail.com
Received:
6
March
2008
Revised:
18
June
2008
Published online:
16
July
2008
This work presents an investigation on the doubly excited
autoionizing states of screened helium atom
lying below the n=4 threshold of the 
ion. The potential
generated in this system is represented by a Yukawa type potential. We have
employed complex-coordinate rotation method, as it is a powerful scheme to
study high lying resonances. Hylleraas type wave function is used to
consider the correlation effect between all the charged particles. Our
resonance parameters for the resonances lying below the
(n=2) threshold agree well with those of the
existing calculations by using the stabilization method. Resonances
associated with higher thresholds are new calculations. All the present
results are well converged with basis length N=444.
PACS: 31.15.ar – Strongly correlated electron systems: generalized tight-binding method / 52.20.Hv – Atomic, molecular, ion, and heavy-particle collisions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2008
