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Abstract <p>This work presents comprehensive calculations of resonance energies and quantum defects associated with photoabsorption and photoionization of singly ionized strontium (Sr II) over a wide energy range, using the modified atomic orbital theory (MAOT). The study focuses on Rydberg series originating from inner-shell transitions of the type 4<i>p</i><sup>6</sup>5<i>s</i> <sup>2</sup><i>S</i><sub>1/2</sub> → 4<i>p</i><sup>4</sup>5<i>s</i> (<sup>1,3</sup><i>P</i>)<i>ns/nd</i>, as well as from doubly excited transitions 4<i>p</i><sup>6</sup>5<i>s</i> <sup>2</sup><i>S</i><sub>1/2</sub> → 4<i>p</i><sup>5</sup>4<i>d</i> (<sup>1,3</sup><i>P</i>,<sup>3</sup><i>D</i>)<i>ns</i>/<i>nd</i>. For the first time, resonance energies are determined for a wide range of principal quantum numbers <i>n</i>, including highly excited states of astrophysical relevance. The MAOT results show excellent agreement with experimental measurements obtained using the double laser plasma (DLP) technique and with multiconfiguration Hartree–Fock (MCHF) calculations reported by Banahan et al. [14]. These findings validate previously uncertain experimental assignments and clarify spectral features affected by strong overlap between the 4<i>d</i> and 5<i>s</i> orbitals and by pronounced configuration interaction. The present results significantly improve the reliability of available spectroscopic data and provide valuable atomic parameters for modeling astrophysical and laboratory plasmas.</p>

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Photoionization and Photoabsorption Study of Sr II Ions in the Framework of the Modified Atomic Orbital Theory

  • 期刊论文

  • 发表日期：

    2026年7月31日

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  • M. T. Gning,
  • B. Diop,
  • I. Sakho

摘要

Abstract

This work presents comprehensive calculations of resonance energies and quantum defects associated with photoabsorption and photoionization of singly ionized strontium (Sr II) over a wide energy range, using the modified atomic orbital theory (MAOT). The study focuses on Rydberg series originating from inner-shell transitions of the type 4p65s 2S1/2 → 4p45s (1,3P)ns/nd, as well as from doubly excited transitions 4p65s 2S1/2 → 4p54d (1,3P,3D)ns/nd. For the first time, resonance energies are determined for a wide range of principal quantum numbers n, including highly excited states of astrophysical relevance. The MAOT results show excellent agreement with experimental measurements obtained using the double laser plasma (DLP) technique and with multiconfiguration Hartree–Fock (MCHF) calculations reported by Banahan et al. [14]. These findings validate previously uncertain experimental assignments and clarify spectral features affected by strong overlap between the 4d and 5s orbitals and by pronounced configuration interaction. The present results significantly improve the reliability of available spectroscopic data and provide valuable atomic parameters for modeling astrophysical and laboratory plasmas.