Relativistic Hartree-Fock and Dirac-Fock atomic structure and radiative parameter calculations in nine-times ionized xenon (Xe X)

Abstract

a b s t r a c tA new set of oscillator strengths and transition probabilities is reported for 92 radiative transitions of nine-times ionized xenon, Xe X, in the extreme ultraviolet region from 110 to 164 Å . They have been obtained by two different theoretical approaches, i.e. the pseudo-relativistic Hartree-Fock (HFR) and the fully relativistic multiconfiguration Dirac-Hartree-Fock (MCDHF) methods, which allowed us to estimate the precision of the final results. The eigenvector compositions are also given for the first time for all the experimentally known energy levels in Xe X.

Electron Impact Excitation of Extreme Ultra-Violet Transitions in Xe7–Xe10 Ions

“…The energies marked with * in Table 4 indicate the inclusion of the CSF 4d 6 4f 3 . For 4p 5 4d 10 levels, our energy results overestimate the measurements [5] and theoretical results [15] by nearly 2 eV. Except for this transition, in most of the cases our energies show better agreements with the experimental results than the MCDHF calculations [15].…”

“…Theoretical results: c-Fahy et al [8], f -Ivanova [13]. For Xe 9+ , our wavelengths and transition rates are compared with the measurements [5] and HFR and MCDHF results [15] in Table 8. Our reported wavelengths show a good match with the experimental results [5] with an average difference of 0.5 Å.…”

“…The maximum difference of nearly 3 eV is found for the 4d 9 4f 1 P 1 level. The energy levels of Xe 9+ are listed in Table 4 and are compared with the measurements [5] as well as HFR and MCDHF calculations of Motoumba et al [15]. The open-shell structure of Xe 9+ leads to the formation of a large number of closely spaced fine-structure levels for its ground and excited state configurations.…”

“…These results were obtained using two different methods viz., the semi-empirical pseudo-relativistic Hartree-Fock (HFR) method and the relativistic multiconfiguration Dirac-Hartree-Fock (MCDHF) theory within the relativistic configuration interaction (RCI) approximation. Motoumba et al [15] also employed the above two methods to report transition probabilities and oscillator strengths for 92 spectral lines of Xe 9+ ion in the range of 11-16.4 nm. Shen et al [16] used Flexible Atomic Code (FAC), based on a fully relativistic approach, to calculate the energy levels, oscillator strengths, electron impact collision strengths as well as effective collision strengths for Xe 10+ .…”