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Complex-scaling treatment for high-lying doubly excited resonances for screened Coulomb helium atom

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Abstract

This work presents an investigation on the doubly excited 1Se 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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Authors and Affiliations

  1. Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei, Taiwan, 106, P.R. China

    Sumana Chakraborty & Yew Kam Ho

Authors
  1. Sumana Chakraborty
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  2. Yew Kam Ho
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Correspondence to Sumana Chakraborty.

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Chakraborty, S., Ho, Y.K. Complex-scaling treatment for high-lying doubly excited resonances for screened Coulomb helium atom. Eur. Phys. J. D 49, 59–65 (2008). https://doi.org/10.1140/epjd/e2008-00140-1

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  • DOI: https://doi.org/10.1140/epjd/e2008-00140-1

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