O. Yu. Andreev

Calculation of quasidegenerate energy levels of two-electron ions

Accurate QED calculations of the interelectron interaction corrections for the (1s2p)2{sup 1}P{sub 1} and (1s2p)2{sup 3}P{sub 1} two-electron configurations for ions with nuclear charge numbers 10{<=}Z{<=}92 are performed within the line profile approach. Total energies of these configurations are evaluated. Employing the fully relativistic treatment based on the j-j coupling scheme these energy levels become quasidegenerate in the region Z{<=}40. To treat such states within the framework of QED we utilize the line profile approach. The calculations are performed within the Coulomb gauge.

Evaluation of the low-lying energy levels of two- and three-electron configurations for highly charged ions

Abstract Accurate QED evaluations of the interelectron interaction for low lying two- and three-electron configurations for ions with nuclear charge numbers 60⩽ Z ⩽93 are presented. The three-photon interaction is also partly taken into account. The results are compared with available experimental data and with different calculations. A detailed investigation of the behaviour of the energy levels of the configurations 1s 1/2 2s 1/2 1 S 0 , 1s 1/2 2p 1/2 3 P 0 near the crossing points Z =64 and Z =92 is carried out. The determination of the crossing points is important for the future experimental search for parity non-conserving effects in highly charged ions.

Effects of autoionization in electron loss from helium-like highly charged ions in collisions with photons and fast atomic particles

We study theoretically single electron loss from helium-like highly charged ions involving excitation and decay of autoionizing states of the ion. Electron loss is caused by either photo absorption or the interaction with a fast atomic particle (a bare nucleus, a neutral atom, an electron). The interactions with the photon field and the fast particles are taken into account in the first order of perturbation theory. Two initial states of the ion are considered:

On the electric dipole moment of the electron and the P,T-odd electron–nucleus interaction in highly-charged heavy ions

1s^2

Electron loss from hydrogen-like highly charged ions in collisions with electrons, protons and light atoms

and

Calculation of differential cross section for dielectronic recombination with one-electron uranium

(1s2s)_{J=0}

Correlated transfer ionization in relativistic collisions of highly charged nuclei with light atoms

. We analyze in detail how the shape of the emission pattern depends on the atomic number

Cross section of double electron capture by bare nucleus

Z_{I}

Evaluation of the electron capture by the H-like Gd ion within line-profile approach

of the ion discussing, in particular, the inter-relation between electron loss via photo absorption and due to the impact of atomic particles in collisions at modest relativistic and extreme relativistic energies. According to our results, in electron loss from the

Radiative double-electron capture by bare nucleus with emission of one photon

1s^2