Relativistic atomic structure calculations, plasma and thermodynamic parameters for Ca X

Abstract

Excitation energies, lifetimes and radiative data including line strengths, oscillator strengths, transition wavelengths and transition probabilities have been reported for electric dipole (E1), magnetic dipole (M1), electric quadrupole (E2) and magnetic quadrupole (M2) transitions for Na-like Ca X ion. These extensive calculations for 1s²2s²2p⁶nl configurations (n = 1 to 7 and l = 0 to 4) of Na like Ca X have been made using multi-configuration Dirac–Fock (MCDF) method. The effect of Breit-interaction and quantum electrodynamics (QED) on energy levels has also been discussed in graphical form. Shift in energy levels due to correlation effects, namely core-valence correlation and valence-valence correlation has also been reported. Further, similar calculations have also been made using the configuration interaction technique (CIV3) and relativistic configuration interaction (RCI) technique to ensure the accuracy of our results. Our calculated results are in good agreement with the available experimental and theoretical data. Plasma parameters like electron density, plasma frequency, coupling parameter and skin depth for the spectral lines 1s²2s²2p⁶3s ²S_1/2  –1s²2s²2p⁶3p ${^2P}_{3/2}^{o}$ (1–3) and 1s²2s²2p⁶3s ²S_1/2–1s²2s²2p⁶3p ${^2P}_{1/2}^{o}$ (1–2) have also been studied for hot dense plasma. We have also reported the line intensity ratio for the spectral lines 1–3 and 1–2. The influence of plasma temperature on the relative population for 1st 2 excited states, partition function and thermodynamic parameters have also been studied. The present results will be helpful in astrophysical plasmas, modelling and characterization of hot dense plasma.