Influence of strongly coupled plasma on the low-lying transitions of Be-like ions

• Published in: The European physical journal. D, Atomic, molecular, and optical physics Vol. 76; no. 11
• Main Authors: Dimri, Mayank, Dawra, Dishu, Singh, A. K., Pandey, Rakesh Kumar, Kumar, Pradumn, Jha, Alok K. S., Mohan, Man
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 01-11-2022; Springer Nature B.V
• Subjects: Applications of Nonlinear Dynamics and Chaos Theory; Atomic; Configuration interaction; Electron density; Free electrons; Molecular; Optical and Plasma Physics; Oscillator strengths; Physical Chemistry; Physics; Physics and Astronomy; Quantum Information Technology; Quantum Physics; Regular Article – Atomic Physics; Spectroscopy/Spectrometry; Spintronics; Strongly coupled plasmas
• ISSN: 1434-6060; 1434-6079
• DOI: 10.1140/epjd/s10053-022-00547-8

The influence of plasma screening on the intercombination 2
s
2
1
S
0
 → 2
snp
3
P
1
o
(
n
 = 2, 3) and resonance 2
s
2 1
S
0
 → 2
snp
1
P
1
o
(
n
 = 2, 3) transitions of Be-like Si
10+
, Ca
16+
and Fe
22+
ions immersed in strongly coupled plasma environment is investigated. The multiconfiguration Dirac–Fock method and relativistic configuration interaction technique have been implemented within the general framework of the ion sphere theory. It has been found that the transition energies associated with Δ
n
 = 0 transitions are blue shifted, while the energies corresponding to Δ
n
 ≠ 0 transitions are red shifted. The variation of weighted oscillator strengths with free electron density has been studied. Thermodynamic pressure experienced by the ions in the ground state 2
s
2 1
S
0
inside the ion sphere is also reported. The results of this study should be of great help in the modeling and the interpretation of spectral properties in laboratory and astrophysical plasmas.
Graphical abstract
Plasma energy shift (ΔE) for the intercombination and resonance transitions as a function of the free electron density for Si
10+
, Ca
16+
and Fe
22+
ions.
a
,
b
Correspond to 2s2 1S0 → 2s2p (3Po1,1Po1) transitions, whereas
c
,
d
correspond to 2
s
2 1
S
0
 → 2
s
2
p
(
3
P
1
o
,
1
P
1
o
) transitions, respectively