Relativistic R-matrix calculations of photoionization cross sections of Cu XVIII

The total photoionization cross sections for the ground state 2 p 6 3 s 2 ( 1 S 0 ) and the lowest three excited states 2 p 6 3 s 3 p ( 3 P o 0,1,2 ) of the Mg-like Cu XVIII ion have been calculated by making use of the close-coupling Breit Pauli R -matrix (BPRM) approximation. The lowest 21 target...

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Published in:The European physical journal. D, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2019-05, Vol.73 (5), p.1-8, Article 85
Main Authors: Singh, Avnindra K., Dawra, Dishu, Dimri, Mayank, Jha, Alok K. S., Mohan, Man
Format: Article
Language:English
Subjects:
Applications of Nonlinear Dynamics and Chaos Theory
Astronomical models
Atomic
Configuration management
Coupling (molecular)
Cross-sections
Ground state
Molecular
Optical and Plasma Physics
Photoionization
Physical Chemistry
Physics
Physics and Astronomy
Plasmas (physics)
Quantum Information Technology
Quantum Physics
Regular Article
Relativism
Relativistic effects
Spectroscopy/Spectrometry
Spintronics
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Summary:The total photoionization cross sections for the ground state 2 p 6 3 s 2 ( 1 S 0 ) and the lowest three excited states 2 p 6 3 s 3 p ( 3 P o 0,1,2 ) of the Mg-like Cu XVIII ion have been calculated by making use of the close-coupling Breit Pauli R -matrix (BPRM) approximation. The lowest 21 target level states of Cu XIX have been included in the photoionization calculations of Cu XVIII. Our calculated target state energies of the core ion Cu XIX show a good agreement with the observed energies tabulated in the NIST database. To further assess the accuracy of our BPRM results, photoionization cross section calculations for the ground state configuration have also been performed by employing the fully relativistic Dirac atomic R -matrix code (DARC). Our two independent calculations show a reasonable agreement between the calculated cross sections in the overall background shape and magnitude. We believe that our cross section data may be beneficial for the modelling and diagnostics of astrophysical and laboratory plasmas. Graphical abstract
ISSN:1434-6060
1434-6079
DOI:10.1140/epjd/e2019-90464-x