[en] The ab initio quasirelativistic Hartree–Fock method developed specifically for the calculation of spectral parameters of heavy atoms and highly charged ions was applied to determine atomic data for tungsten ions. The correlation effects were included by adopting the configuration interaction method. The Breit–Pauli approximation for quasirelativistic Hartree–Fock radial orbitals was employed to take into account relativistic effects. The energy level spectra, radiative lifetimes, Lande factors g were calculated for the 4p⁶4d, 4p⁶4f and 4p⁵4d² configurations of W³⁷⁺ ion. The atomic data, namely, the transition wavelengths, spontaneous emission rates and oscillator strengths for the electric dipole, electric quadrupole and magnetic dipole transitions among and within the levels of these configurations are tabulated.

[en] The ab initio quasirelativistic Hartree–Fock method developed specifically for the calculation of spectral parameters of heavy atoms and highly charged ions is used to derive transition data for a multicharged tungsten ion. The configuration interaction method is applied to include electron correlation effects. The relativistic effects are taken into account in the Breit–Pauli approximation for quasirelativistic Hartree–Fock radial orbitals. The energy level spectra, radiative lifetimes and Lande g-factors are calculated for the 4p⁶4d², 4p⁶4d4f, and 4p⁵4d³ configurations of the ion W³⁶⁺. The transition wavelengths, spontaneous transition probabilities, oscillator strengths, and line strengths for the electric dipole, electric quadrupole, electric octupole, and magnetic dipole transitions among the levels of these configurations are tabulated

[en] The ab initio quasirelativistic Hartree–Fock method developed specifically for the calculation of spectroscopic parameters of heavy atoms and highly charged ions was used to derive spectral data for the multicharged tungsten ion W"3"5"+. The configuration interaction method was applied to include the electron-correlation effects. The relativistic effects were taken into account in the Breit–Pauli approximation for quasirelativistic Hartree–Fock radial orbitals. The energy level spectra, radiative lifetimes τ, and Lande g-factors have been calculated for the 4p"64d"3, 4p"64d"24f, and 4p"54d"4 configurations of the W"3"5"+ ion

[en] Energies of the lowest 157 levels belonging to the (1s²) 2s²2p⁶, 2s²2p⁵3l, 2s²2p⁵4l, 2s²2p⁵5l, 2s2p⁶3l, 2s2p⁶4l and 2s2p⁶5l configurations of Fe-XVII have been calculated using the GRASP code of Dyall et al. (1989). Additionally, radiative rates, oscillator strengths, and line strengths are calculated for all electric dipole (E1), magnetic dipole (M1), electric quadrupole (E2), and magnetic quadrupole (M2) transitions among these levels. Comparisons are made with the results already available in the literature, and the accuracy of the data is assessed. Our energy levels are expected to be accurate to better than 1%, whereas results for other parameters are probably accurate to better than 20%. (authors)

[en] The ab initio quasirelativistic approach developed specifically for the calculation of spectral parameters of highly charged ions was used to derive transition data for the Ru-like tungsten ion W${}^{30+}$. The configuration interaction method was applied to include electron correlation effects. The relativistic effects were taken into account in the Breit–Pauli approximation. The level energies, radiative lifetimes $\tau$, Landé $g$-factors were determined for the ground configuration 4p⁶4d⁸ and two excited configurations 4p⁵4d⁹ and 4p⁶4d⁷4f. The radiative transition wavelengths $\lambda$ and emission transition probabilities $A$ for the electric dipole, electric quadrupole, electric octupole, magnetic dipole, and magnetic quadrupole transitions among the levels of these configurations were generated.

[en] The ab initio quasirelativistic approach developed specifically for the calculation of spectral parameters of highly charged ions was used to derive transition data for the Nb-like tungsten ion W³³⁺. The configuration interaction method was applied to include electron correlation effects. The relativistic effects were taken into account in the Breit–Pauli approximation. The level energies, radiative lifetimes $\tau$, Landé $g$-factors were determined for the ground configuration 4p⁶4d⁵ and two excited configurations 4p⁵4d⁶ and 4p⁶4d⁴4f. The radiative transition wavelengths $\lambda$ and emission transition probabilities $A$ for the electric dipole, electric quadrupole, electric octupole, magnetic dipole, and magnetic quadrupole transitions among the levels of these configurations were produced. The uncertainties of computed spectroscopic parameters were evaluated.

[en] Electron scattering from hydrogen-like He⁺, Fe²⁵⁺ and U⁹¹⁺ ions has been studied using the R-matrix method with non-relativistic and relativistic approximations. The case of transitions 1s-2s and 1s-2p as well as transitions between fine structure n=2 levels was considered. Collision strengths have been calculated for the energy range from n = 2 excitation threshold to the ionization threshold. Effective collision strengths obtained by integrating collision strengths over Maxwellian distribution of electron velocities were compared with results of other calculations. (Author)

[en] Energy levels and emission spectra of W²⁵⁺ ion have been studied by performing the large-scale relativistic configuration interaction calculations. Configuration interaction strength is used to determine the configurations exhibiting the largest influence on the 4f³, 4d⁹4f⁴, 4f²5s, 4f²5p, 4f²5d, 4f²5f, 4f²5g, and 4f²6g configuration energies. It is shown that correlation effects are crucial for 4f²5s→4f³ transition which in a single-configuration approach occurs due to the weak electric octupole transitions. As well, the correlation effects affect 4f²5d→4f³ transitions by increasing transition probabilities by an order. The corona model has been used to estimate the contribution of various transitions to the emission in a low-density electron beam ion trap (EBIT) plasma. Modeling in 10–30 nm wavelength range produces lines which do not form emission bands and can be observed in EBIT plasma. - Highlights: • Energy levels and radiative transition probabilities are studied for the W²⁵⁺ ion. • Correlation effects are investigated for main configurations of the ion. • The corona model is used to find lines in spectra

[en] The ab initio quasirelativistic approach was used to derive transition data for Pd-like tungsten W${}^{28+}$ ion. This approach was developed specifically for the calculation of spectral parameters for highly charged ions. The relativistic effects were taken into account in the Breit–Pauli approximation. The configuration interaction method was applied to include electron correlation effects. The ground configuration ${4\mathrm{p}}^6{4\mathrm{d}}^{10}$ and the lowest excited ${4\mathrm{p}}^6{4\mathrm{d}}^{9}4\mathrm{f}$ were considered. The calculations for W${}^{28+}$ were performed with different sets of interacting configurations in order to evaluate reliability and accuracy of produced results. Level energies, radiative lifetimes $\tau$, Landé $g$-factors were determined for the excited configuration ${4\mathrm{p}}^6{4\mathrm{d}}^{9}4\mathrm{f}$ of W${}^{28+}$ levels. The radiative transition wavelengths $\lambda$ and emission transition probabilities $A$ for the electric and magnetic transitions of various multipole order (up to E5 and M4) among the levels of these two configurations were produced. The uncertainties of computed spectroscopic parameters were evaluated.

[en] The database ADAMANT of atomic parameters for the simulation of the electromagnetic radiation from plasma is established (www.adamant.tfai.vu.lt). The energy levels, radiative and autoionization transition probabilities, electron-impact excitation and ionization as well as dielectronic recombination rates for atoms and ions are constantly added to the database. (paper)