RELATIVISTIC SPECTROSCOPY OF ATOMIC SYSTEMS: SPECTRAL LINES BROADENING AND SHIFT FOR HEAVY ELEMENTS IN THE BUFFER GAS AND PLASMAS ENVIRONMENT

Abstract

It has been developed a modified relativistic approach to describing the shift and broadening due to collisions of spectral lines of hyperfine structure for alkali atoms in an atmosphere of buffer (inert) gases. The approach is based on the generalized kinetic theory of spectral lines, exchange, relativistic perturbation theory with the Dirac-Hartree-Slater zeroth approximation and accounting for the complicated correlation effects by means of using the many-body polarization density-dependent functionals. The basic expressions for the collision shift and broadening hyperfine structure spectral lines are taken from the kinetic theory of spectral lines. The exchange perturbation theory (the modified version ЕL-НАV) has been used to calculate the corresponding potentials. The results of calculating the interatomic potentials, local shifts, temperature dependent spectral line shifts for the systems of the Rb, Cs-He are listed and compared with available theoretical and experimental data. The important feature of our scheme is correct taking into account the correlation (polarization) effects with using special effective functionals from. The difference between our theoretical data and other calculation results can be explained by using different perturbation theory versions and different approximations for calculating the wave functions basis’s.