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Photoionization of ground and excited states of Cr VIII with Rydberg series analysis of resonances involved

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Abstract

The relativistic calculations of total photoionization (PI) cross sections of Cr VIII in the ground 3s23p5(2Po3/2) and the first two excited states 3s23p5(2Po1/2), 3s13p6(2Se1/2) have been performed by taking the lowest 41 target states of sulphur-like Cr IX in Breit–Pauli R-matrix method for the first time, to our knowledge. The target states and their energies are calculated using a very accurate configuration interaction technique. Our theoretical energy levels of the lowest 41 target states of Cr IX agree with the experimental NIST data results. We have discussed photoionization cross-section variation, analysed resonance structures, determined resonance positions, effective quantum number, and width of nd Rydberg series of Cr VIII using Quigley and Berrington’s approach. We have identified nd resonant series below the first threshold in the photon energy range 13.82–14.00 Ryd. We believe that our photoionization study of Cr VIII will be useful in astrophysical plasmas’ modelling and their diagnostics.

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Acknowledgements

The first author (FY) is thankful to the UGC, India, for Junior Research Fellowship. Arun Goyal is thankful to the ShyamLal College, University of Delhi, and Narendra Singh is thankful to the Zakir Husain Delhi College, University of Delhi, for providing computer facilities.

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Authors and Affiliations

  1. Department of Physics and Astrophysics, Delhi University, New Delhi, Delhi, 110007, India

    Falta Yadav & Man Mohan

  2. Department of Physics, Shyamlal College, Delhi University, New Delhi, Delhi, 110032, India

    Arun Goyal

  3. Zakir Husain Delhi College, Delhi University, New Delhi, Delhi, 110002, India

    Narendra Singh

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  1. Falta Yadav
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  2. Arun Goyal
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  3. Narendra Singh
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  4. Man Mohan
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Correspondence to Arun Goyal.

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Yadav, F., Goyal, A., Singh, N. et al. Photoionization of ground and excited states of Cr VIII with Rydberg series analysis of resonances involved. Indian J Phys 98, 1573–1582 (2024). https://doi.org/10.1007/s12648-023-02955-x

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  • DOI: https://doi.org/10.1007/s12648-023-02955-x

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