Kuznetsova A. Theoretical spectroscopy of complex atomic systems in an intense electromagnetic field

The dissertation is devoted to the development of new theoretical relativistic spectroscopy of multielectron atomic systems in an intense external electric, electromagnetic field simultaneous, sequential consideration of relativistic, photon-correlation and exchange-polarization effects as well as effects of significantly non-coulomb level’s grouping in Rydberg spectra. A new relativistic approach to the calculation of the energy characteristics of atoms, energies and widths of Stark resonances in an external constant electric field (DC Stark effect) and external alternating electric field (АC Stark effect) of arbitrary strength has been developed, based on the relativistic operator perturbation theory and the apparatus of a multiparticle relativistic perturbation theory with zero local the Dirac-Fock-Slater approximation as well as the concept of quasi-stationary, quasi-energy states. A new procedure for calculating matrix elements of operators on the basis of wave functions is proposed. Results of calculation of energies and widths of Stark resonances in the spectrum of Rydberg states of atoms Li, H, Na, Rb, К, Сs; autoionization, Rydberg Stark resonances in the spectra Yb, Gd, Tm are presented. The scaling effect in the dependences of the induced energies and the widths of Stark resonances vs the induced electric field strength F is. is studied. Data of calculations of amplitudes of radiation transitions, oscillator strengths, atomic polarizabilities for alkali elements, rare earth elements and inert gases (Na, K, Rb, Cs, Ar, Kr, Xe, Yb,. Tm) are listed. A study of the dynamics of ionization of Li, Rb, Tm atoms in the Rydberg states is conducted. The results of calculations of the radiation widths of levels, effective lifetimes, BBR-ionization rates, Stark shift coefficient, parameter β for BBR shift of atomic transition frequencies for individual Rydberg nS, nP, nD states of atoms of alkaline elements Na, K, Rb, Cs are presented.