Radiative and collisional spectroscopy of hyperfine lines of the Li-like heavy ions and Tl atom in an atmosphere of inert gases

Abstract

The combined relativistic energy approach and relativistic many-body perturbation theory with an optimized zeroth one-particle approximation are used for the calculation of the Li-like ions (Z = 11–42, 69, 70) and thallium atom spectral parameters of radiative transitions from the ground state to the excited state. A key feature of the presented approach is an implementation of the optimized relativistic model potential method in the framework of the energy approach for further studying the spectral and collisional characteristics of the multi-electron atoms. In addition, the method combined with the spectral line kinetic theory is used to study the hyperfine structure collision shift for the Tl atom in an atmosphere of inert gases.