Effect of screening on spectroscopic properties of Li-like ions in plasma environment

TL;DR

This study uses relativistic coupled-cluster theory to accurately analyze how plasma screening affects the spectroscopic properties of Li-like ions, revealing significant changes in ionization potentials and transition probabilities with plasma conditions.

Contribution

It provides the first detailed ab initio calculations of Li-like ions in plasma environments using relativistic coupled-cluster theory with Breit interaction inclusion.

Findings

Ionization potential decreases sharply with increased plasma screening.

Oscillator strengths for certain transitions increase with screening strength.

Transition probabilities for some transitions decrease as plasma effects intensify.

Abstract

This work presents accurate {\it ab initio} investigations of various spectroscopic properties of a few Li-like ions in presence of a plasma environment within the Debye screening potential. The coupled-cluster theory in the relativistic framework has been employed to compute ionization potentials, excitation energies, electric dipole oscillator strengths, and electric quadrupole transition probabilities of Li-like C$^{3+}$, N$^{4+}$, and O$^{5+}$ ions. The unretarded Breit interaction has been implemented to increase the accuracy of the calculations. The effects of ion density and temperature on the ionization potentials, excitation energies, electric dipole oscillator strengths, and electric quadrupole transition probabilities have been investigated in the plasma environment. It is found that the plasma screening leads to a sharp decrease in the ionization potential as the screening strength increases. With increasing strength, the oscillator strengths associated with 2$s ^{2}S_{1/2}$$\rightarrow2 p ^{2}P_{1/2, 3/2}$ transitions increase, whereas the transition probabilities associated with 3$d ^2D_{3/2, 5/2}$$\rightarrow2 s ^2S_{1/2}$ transitions decrease.