Plasma-screening effects in the astrophysically relevant He-like and Li-like Mg and Fe ions

The effect of plasma environment on the atomic energy levels of He-like and Li-like Mg and Fe ions have been studied using Debye model. The equation-of-motion coupled-cluster (EOMCC) and Fock-space coupled-cluster (FSCC) formalisms in the relativistic frame work have been adopted to describe the ato...

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Bibliographic Details
Published in:The European physical journal. D, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2016-12, Vol.70 (12), p.1-10, Article 270
Main Authors: Sahoo, Bijaya Kumar, Das, Madhulita
Format: Article
Language:English
Subjects:
Angular momentum
Applications of Nonlinear Dynamics and Chaos Theory
Atomic
Atomic energy levels
Atomic states
Clusters
Equations of motion
Fine structure
Helium
Iron
Magnesium
Metal ions
Molecular
Multipoles
Optical and Plasma Physics
Photoionization
Physical Chemistry
Physics
Physics and Astronomy
Plasma
Plasmas (physics)
Quantum Information Technology
Quantum Physics
Regular Article
Screening
Spectroscopy/Spectrometry
Spintronics
Topical Issue: Low-Energy Interactions related to Atmospheric and Extreme Conditions
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Summary:The effect of plasma environment on the atomic energy levels of He-like and Li-like Mg and Fe ions have been studied using Debye model. The equation-of-motion coupled-cluster (EOMCC) and Fock-space coupled-cluster (FSCC) formalisms in the relativistic frame work have been adopted to describe the atomic states and the energy levels of the above plasma embedded ions. Salient features of these methods have been described to account the two electron screening effects through the Debye potentials. The two-body screening potential has been derived in the multipole expansion form to evaluate the reduced matrix elements in solving the equation of motion. Using this extended model, we have also predicted that quasi-degeneracy among the energy states having same principal quantum number ( n ) but different angular momentum ( l ) is slacken, whereas fine structure splitting is unaffected with increasing plasma strength. These knowledge are useful in estimating radiative opacity, photoionization cross sections, line intensities, etc of the aforementioned astrophysical plasmas. Graphical abstract
ISSN:1434-6060
1434-6079
DOI:10.1140/epjd/e2016-70541-6