Complex-scaling treatment for high-lying doubly excited resonances for screened Coulomb helium atom |
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Authors: | Sumana Chakraborty Yew Kam Ho |
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Institution: | (1) Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei, Taiwan, 106, P.R. China |
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Abstract: | This work presents an investigation on the doubly excited 1S
e
autoionizing states of screened helium atom lying below the n = 4 threshold of the He+ 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 He+ (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. |
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Keywords: | PACS" target="_blank">PACS 31 15 ar Strongly correlated electron systems: generalized tight-binding method 52 20 Hv Atomic molecular ion and heavy-particle collisions |
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