S. Kučas

Auger cascade satellites following 3d ionization in xenon

The electron spectra of xenon have been measured at the kinetic energy region of 8–40 eV using synchrotron radiation excitation below and above the 3d ionization threshold. The hole in the 3d orbital leads to the cascade of Auger transitions, the final steps of which give rise to pronounced satellite structures at the low kinetic energy region. In order to estimate the satellite production, the average kinetic energies and transition probabilities of Auger transitions after 3d ionization have been calculated using the method of global characteristics. Furthermore, the fine structure of the most intense satellite Auger transitions has been calculated using the pseudorelativistic Hartree–Fock method, and the results have been used to assign the main satellite peaks. In addition, the production of multi-charged Xe ions has been investigated and the role of electron–electron interaction in explaining the remaining differences between experiment and theory has also been discussed.

Magnetic dipole transitions in 4d{sup N} configurations of tungsten ions

Magnetic dipole transitions between the levels of ground

On the interpretation of the intense emission of tungsten ions at about 5 nm

4{d}^{N}

Global characteristics of atomic spectra and their use for the analysis of spectra. IV. Configuration interaction effects

configurations of tungsten ions were analyzed by employing a large basis of interacting configurations. Previously introduced configuration interaction strength between two configurations was used to determine the configurations with the largest contribution to wave functions of atomic states for the considered configurations. Collisional-radiative modeling was performed for the levels of the ground configuration coupled through electric dipole transitions with

The essential role of many-electron Auger transitions in the cascades following the photoionization of 3p and 3d shells of Kr

4{p}^{5}4{d}^{N+1}

Global characteristics of atomic spectra and their use for the analysis of spectra. III. Auger spectra

and

CASCADES AFTER K-VACANCY PRODUCTION AND ADDITIONAL IONIZATION OR EXCITATION IN ATOMS OF LIGHT ELEMENTS

4{d}^{N\ensuremath{-}1}4f

Auger decay of 3p-ionized krypton

configurations. New identification of some lines observed in the electron-beam ion trap plasma was proposed based on calculations in which wavelength convergence was reached.

Global characteristics of atomic spectra and their use for the analysis of spectra. II. characteristic emission spectra

The origin of the intense emission band at about 5 nm, dominating the emission spectra of tungsten ions in the ASDEX Upgrade tokamak and EBIT, is discussed. It is shown that the emission spectra of various ions calculated taking into account only the excitations from the ground level agree fairly well with the results obtained in the collisional-radiative model; thus, the contribution of the excitations from the other levels is small. Though the excitation spectrum for all sequence of ions W29+–W37+ corresponds to the same transitions 4p64dN→ 4p54dN+1+ 4p64dN−1 4f, its energetic width essentially changes going on from the charge of ion q = 34 to q = 35. It is caused by the appearance of the excitations 4p1/2–4d3/2 to the open 4dN3/2 subshell, which are not quenched by configuration mixing. The satellite line at about 4.5 nm is explained by the transitions of the same type, although between configurations with one spectator 5s electron. The existence of one more group of intense lines in the region of 2 nm, corresponding to 5s–4p transitions, is predicted.

Contribution of high-nl shells to electron-impact ionization processes

Changes of the moments of atomic spectrum due to configuration interaction (CI), the CI strength, the average shift of the energy of a level due to its interaction with all levels of distant configuration and other global characteritics of CI effects in atoms are systematised and their expressions presented. The results of the calculation of these characteristics for the energy level spectra of the 3s3p3 + 3s23p3d configurations in Si isoelectronic series, 3p53dN + 3p63dN−24p + 3p63dN−24f (N = 5, 6, 7, 8) in Cr, Mn, Fe and Co isoelectronic series, ns2 npN + npN+2 at n = 2 – 5 and N = 2 – 4 in neutral atoms as well as for the characteristic emission spectra corresponding to the 3p53d9 + 3d74p → 3d8 transitions as well as for the Auger M4,5N1N2,3 spectra in Kr and N4,5O1O2,3 in Xe are given and compared with the same characteristics of the more complete experimental spectra.