Isotope shift of the 2s ²S_1/2 → 2p ²P_1/2,3/2 transitions of Li-like Ca ions*

Abstract

The mass- and field-shift parameters of the two 2s 2S1/2 → 2p 2P1/2,3/2 transitions in the Li-like Ca ions are calculated by using multi-configuration Dirac–Hartree–Fock (MCDHF) and the relativistic configuration interaction (RCI) methods with the inclusion of the transverse photon (Breit) interaction, vacuum polarization and self-energy corrections. In addition, the mass shift and field shift of these two transitions are calculated, where the field shift is calculated by using the evaluated value δ〈 r 2〉 obtained by [Atomic Data and Nuclear Data Tables 99 69 (2013)]. It is found that the mass shift of Li-like Ca ions is greater than the field shift.

Fully relativistic many-body perturbation energies, transition properties, and lifetimes of lithium-like iron Fe XXIV

“…Due to the importance of lithium-like ions, there have been many studies on the ions. [3,[6][7][8][9][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] In particular, Nahar et al [28] (hereafter referred to as Nahar1999) used the quasi-relativistic Breit-Pauli R-matrix method (BPRM) to calculate E1 transition radiative rates between energy levels up to n = 10 for lithium-like iron. In their calculations, they just added one-body relativistic correction terms to the non-relativistic Hamiltonian, [31] which included the one-body mass correction, the one-body Darwin term, and the spin-orbit term, they did not even include the two-body interactions in the Breit-Pauli approximation (such as the spin-other orbit, spin-spin, orbit-orbit, two-body Darwin, and spin-contact terms).…”