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Atoms 2018, 6(3), 41;

Doubly-Excited States of Beryllium-Like Ions with Screened Coulomb Potentials

Department of Mathematics, Burdwan University, Golapbag, Burdwan 713104, West Bengal, India
Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, Taipei 106, Taiwan
Author to whom correspondence should be addressed.
Received: 6 July 2018 / Revised: 29 July 2018 / Accepted: 30 July 2018 / Published: 1 August 2018
(This article belongs to the Section Atomic, Molecular and Nuclear Spectroscopy and Collisions)
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The screening effects of the interaction potentials on the lowest 1S doubly-excited states of beryllium-like ions were investigated by calculating the density of resonance states within the framework of the stabilization method. Two types of screened interaction potentials, namely static screened Coulomb potential and exponential cosine screened Coulomb potential, were taken into consideration. A model potential was used to describe the interaction between the core and outer electrons, and the Be-like ions were treated as being effectively three-body systems. Calculations were performed for Be and B+. It was possible to calculate the energy and width of one doubly-excited state of Be and four doubly-excited states of B+ lying above the 1s22p threshold. Significant changes were found to exist in the behaviour of the width with varying screening parameters. To the best of our knowledge, such an investigation on the doubly-excited states of Be-like ions under screened environments is the first reported calculation of this type in the literature. View Full-Text
Keywords: beryllium-like ions; screened potentials; doubly-excited states; resonance; stabilization method beryllium-like ions; screened potentials; doubly-excited states; resonance; stabilization method

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Ghoshal, A.; Ho, Y.K. Doubly-Excited States of Beryllium-Like Ions with Screened Coulomb Potentials. Atoms 2018, 6, 41.

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