Optimal classification of HCI spectra

Energy levels of highly charged ions as a rule cannot be classified using LS coupling due to rapid increase of relativistic effects. It is suggested, for optimal classification of energy spectra, to calculate them in LS coupling and to transform the weights of the wave functions, obtained after diagonalization of the energy matrix, to the other coupling schemes. F-like ions are considered as an example

Theoretical lifetimes for all states of five Cl X configurations

Ab initio calculations including relativistic and correlation corrections were performed to obtain energy spectra and lifetimes for all states of first five configurations of Cl X

Ab initio wavelengths and oscillator strengths for Cl X

Using the configuration interaction technique, the energy spectra of 2s(2)2p(4), 2s2p(5), 2s(2)2p(3)3s, 2s(2)2p(3)3d, configurations of oxygen-like chlorine Cl X have been calculated. The obtained data are used for the evaluation of wavelengths and oscillator strengths of all possible one-electron and two-electron 2s(2)2P(3)3p-2s2p(5) electric dipole transitions. The calculated results are compared with recent experimental data

Additional symmetry for the electronic shell in its ground state and many-electron effects

The additional symmetry for the properties related to the ground state of the atom is considered taking into account many-electron effects. Calculations of the $I_{4f}, I_{3d},I_{2p},I_{3p}$ binding energies, $4f^{N-1}5d$ – $4f^{N}$ system differences and 2p, 3p electron affinities in the second order of perturbation theory and in the configuration interaction approximation have been performed for the ground configurations with one open shell. The analysis of separate many-electron corrections for these quantities and their variation along the sequences of atoms and ions shows that the main corrections maintain the considered symmetry

Out of the shadows: a classification of economies by the size and character of their informal sector

Given that 60 per cent of the global workforce is in the informal sector, this article develops a typology that classifies economies according to, firstly, where different countries sit on a continuum of informalization and, secondly, the character of their informal sectors. This is then applied to the economies of the 27 member states of European Union (EU-27). Finding a clear divide from east to west and south to north in the EU-27, with the more informalized and wage-based informal economies on the eastern/southern side and the less informalized and more own-account informal economies on the western/Nordic side, it is then revealed that formalization and more own-account informal sectors are significantly correlated with wealthier and more equal (as measured by the gini-coefficient) countries in which there is greater labour market intervention, higher levels of social protection and more effective redistribution via social transfers. The article concludes by discussing the implications for theory and practice